str_ireplace
A proper unicode string padder;
<?php
mb_internal_encoding('utf-8'); // @important
function str_pad_unicode($str, $pad_len, $pad_str = ' ', $dir = STR_PAD_RIGHT) {
$str_len = mb_strlen($str);
$pad_str_len = mb_strlen($pad_str);
if (!$str_len && ($dir == STR_PAD_RIGHT || $dir == STR_PAD_LEFT)) {
$str_len = 1; // @debug
}
if (!$pad_len || !$pad_str_len || $pad_len <= $str_len) {
return $str;
}
$result = null;
$repeat = ceil($str_len - $pad_str_len + $pad_len);
if ($dir == STR_PAD_RIGHT) {
$result = $str . str_repeat($pad_str, $repeat);
$result = mb_substr($result, 0, $pad_len);
} else if ($dir == STR_PAD_LEFT) {
$result = str_repeat($pad_str, $repeat) . $str;
$result = mb_substr($result, -$pad_len);
} else if ($dir == STR_PAD_BOTH) {
$length = ($pad_len - $str_len) / 2;
$repeat = ceil($length / $pad_str_len);
$result = mb_substr(str_repeat($pad_str, $repeat), 0, floor($length))
. $str
. mb_substr(str_repeat($pad_str, $repeat), 0, ceil($length));
}
return $result;
}
?>
Test;
<?php
// needs ie. "test.php" file encoded in "utf-8 without bom"
$s = '...';
for ($i = 3; $i <= 1000; $i++) {
$s1 = str_pad($s, $i, 'AO', STR_PAD_BOTH); // can not inculde unicode char!!!
$s2 = str_pad_unicode($s, $i, 'ÄÖ', STR_PAD_BOTH);
$sl1 = strlen($s1);
$sl2 = mb_strlen($s2);
echo "len $sl1: $s1 \n";
echo "len $sl2: $s2 \n";
echo "\n";
if ($sl1 != $sl2) die("Fail!");
}
?>
Output;
len 3: ...
len 3: ...
len 4: ...A
len 4: ...Ä
len 5: A...A
len 5: Ä...Ä
len 6: A...AO
len 6: Ä...ÄÖ
...
str_pad
(PHP 4 >= 4.0.1, PHP 5)
str_pad — 使用另一个字符串填充字符串为指定长度
说明
string str_pad
( string
$input
, int $pad_length
[, string $pad_string = " "
[, int $pad_type = STR_PAD_RIGHT
]] )
该函数返回 input 被从左端、右端或者同时两端被填充到制定长度后的结果。如果可选的 pad_string 参数没有被指定，input 将被空格字符填充，否则它将被 pad_string 填充到指定长度。
参数
-
input -
输入字符串。
-
pad_length -
如果
pad_length的值是负数，小于或者等于输入字符串的长度，不会发生任何填充。 -
pad_string -
Note:
如果填充字符的长度不能被
pad_string整除，那么pad_string可能会被缩短。 -
pad_type -
可选的
pad_type参数的可能值为STR_PAD_RIGHT，STR_PAD_LEFT或STR_PAD_BOTH。如果没有指定pad_type，则假定它是STR_PAD_RIGHT。
返回值
返回填充后的字符串。
范例
Example #1 str_pad() 范例
<?php
$input = "Alien";
echo str_pad($input, 10); // 输出 "Alien "
echo str_pad($input, 10, "-=", STR_PAD_LEFT); // 输出 "-=-=-Alien"
echo str_pad($input, 10, "_", STR_PAD_BOTH); // 输出 "__Alien___"
echo str_pad($input, 6 , "___"); // 输出 "Alien_"
?>
add a note
User Contributed Notes
str_pad - [31 notes]
qeremy [atta] gmail [dotta] com ¶
4 months ago
Spudley ¶
5 years ago
Warning: If your string includes non-ascii characters (eg the British pounds sign), str_pad() will treat these as two characters when calculating the padding.
So for example:
<?php
str_pad($currency_symbol.$showtottopay,12," ",STR_PAD_LEFT);
?>
will produce a different length string depending on whether $currency_symbol is pounds or dollars.
Hope this helps someone -- it caused me a lot of problems with misaligned columns in my invoices until I worked it out.
christian dot reinecke at web dot de ¶
6 years ago
Fills the first argument (mostly a number, f.e. from a <select> loop to display a date or time) with zeroes.
<?php
function zerofill($mStretch, $iLength = 2)
{
$sPrintfString = '%0' . (int)$iLength . 's';
return sprintf($sPrintfString, $mStretch);
}
?>
sprintf() is indeed faster than str_pad.
zubfatal <root at it dot dk> ¶
8 years ago
<?php
/**
* str_pad_html - Pad a string to a certain length with another string.
* accepts HTML code in param: $strPadString.
*
* @name str_pad_html()
* @author Tim Johannessen <root@it.dk>
* @version 1.0.0
* @param string $strInput The array to iterate through, all non-numeric values will be skipped.
* @param int $intPadLength Padding length, must be greater than zero.
* @param string [$strPadString] String to pad $strInput with (default: )
* @param int [$intPadType] STR_PAD_LEFT, STR_PAD_RIGHT (default), STR_PAD_BOTH
* @return string Returns the padded string
**/
function str_pad_html($strInput = "", $intPadLength, $strPadString = " ", $intPadType = STR_PAD_RIGHT) {
if (strlen(trim(strip_tags($strInput))) < intval($intPadLength)) {
switch ($intPadType) {
// STR_PAD_LEFT
case 0:
$offsetLeft = intval($intPadLength - strlen(trim(strip_tags($strInput))));
$offsetRight = 0;
break;
// STR_PAD_RIGHT
case 1:
$offsetLeft = 0;
$offsetRight = intval($intPadLength - strlen(trim(strip_tags($strInput))));
break;
// STR_PAD_BOTH
case 2:
$offsetLeft = intval(($intPadLength - strlen(trim(strip_tags($strInput)))) / 2);
$offsetRight = round(($intPadLength - strlen(trim(strip_tags($strInput)))) / 2, 0);
break;
// STR_PAD_RIGHT
default:
$offsetLeft = 0;
$offsetRight = intval($intPadLength - strlen(trim(strip_tags($strInput))));
break;
}
$strPadded = str_repeat($strPadString, $offsetLeft) . $strInput . str_repeat($strPadString, $offsetRight);
unset($strInput, $offsetLeft, $offsetRight);
return $strPadded;
}
else {
return $strInput;
}
}
?>
david dot rensonnet at swing dot be ¶
10 years ago
my solution to saveloywill at netscape dot net:
$myvar2="Alien";
$myvar=str_pad($myvar2,15," ",STR_PAD_RIGHT);
$myvar=str_replace(" "," ",$myvar);
this way, only complete spaces will show up.
enjoy!
david rensonnet
pozytron#mac#com ¶
10 years ago
The trouble with cj@NOSPAM.ceejayoz.com's version over pestilenc@hotmail.com's is that many of the times it is used, it will end up with fragments of the " " code.
For example, the following code:
<?php
echo str_pad("TESTSTRING",60," ",STR_PAD_BOTH);
?>
produces the following HTML output:
&TESTSTRING &
matrebatre ¶
4 years ago
Here is a simple function to convert numbers into strings like this:
0 => 0000
1 => 0001
20 => 0020
432 => 0432
<?php
function number_pad($number,$n) {
return str_pad((int) $number,$n,"0",STR_PAD_LEFT);
}
?>
$n indicates how many characters you want.
cj at NOSPAM dot ceejayoz dot com ¶
10 years ago
Another solution to no_email@php.net's problem would be to simply multiply the padding string by 6.
e.g.
$string = str_pad($string, 10, " ", STR_PAD_BOTH);
becomes
$string = str_pad($string, 60, " ", STR_PAD_BOTH);
which will avoid problems with the above solution, which will mess up text that has the * in it (or whichever character you're replacing)
gene at swipesy dot com ¶
1 year ago
This is how I pad using :
str_replace(" ", " ", str_pad($foo, 10, " ", STR_PAD_LEFT))
Seems to work well using two tags for each character added, at least for my use. YMMV.
Kari "Haprog" Sderholm ¶
4 years ago
Here's a quick and simple way to make an mb_str_pad function that works when you have correctly set your internal encoding.
I'm not sure how well this works in all possible scenarios but atleast it worked for me using UTF-8 as internal encoding and using this function on strings containing scandinavian characters "åäöÅÄÖ" that are double byte in UTF-8.
<?php
function mb_str_pad($input, $pad_length, $pad_string=' ', $pad_type=STR_PAD_RIGHT) {
$diff = strlen($input) - mb_strlen($input);
return str_pad($input, $pad_length+$diff, $pad_string, $pad_type);
}
?>
bxi at apparoat dot nl ¶
5 years ago
In case you want to pad 2 strings together with a character you can use:
<?php
function pad_between_strings($string1, $string2, $length, $char = " ") {
$fill_length = $length - ( strlen($string1) + strlen($string2) );
return $string1 . str_repeat($char, $fill_length) . $string2;
}
?>
saveloywill at netscape dot net ¶
10 years ago
Here is my solution to the above problem.
Simply place the code in question inbetween html <pre> tags, like this:
<?php
print "<pre>";
$input = "Alien";
print str_pad($input, 10);
print "*";
print "</pre>";
?>
Thanks.
Silvio Ginter (silvio dot ginter at gmx dot de) ¶
7 years ago
Hello,
for anyone who needs this, I wrote this extension to str_pad. For details, just look at the comments.
<?php
$string = 'this is a test';
$oldLen = strlen($string);
$direction = STR_PAD_BOTH;
echo $string.'<br>';
echo str_const_len($string, 101, '#', $direction).'<br>';
echo $string.'<br>';
echo str_const_len($string, $oldLen, '#', $direction).'<br>';
echo $string.'<br><br>'."\n";
/* This function is an extension to str_pad, it manipulates the referenced
string '$str' and stretches or reduces it to the specified length. It
returns the number of characters, that were added or stripped. */
function str_const_len(&$str, $len, $char = ' ', $str_pad_const = STR_PAD_RIGHT) {
$origLen = strlen($str);
if (strlen($str) < $len) { /* stretch string */
$str = str_pad($str, $len, $char, $str_pad_const);
}
else { /* reduce string */
switch ($str_pad_const) {
case STR_PAD_LEFT:
$str = substr($str, (strlen($str) - $len), $len);
break;
case STR_PAD_BOTH:
$shorten = (int) ((strlen($str) - $len) / 2);
$str = substr($str, $shorten, $len);
break;
default:
$str = substr($str, 0, $len);
break;
}
}
return ($len - $origLen);
}
?>
bob [at] bobarmadillo [dot] com ¶
10 years ago
In a lot of cases you're better off using str_repeat if you want to use something like - it repeats the entire string.
Using str_repeat, I wrote a full string pad function that should closely mimic str_pad in every other way:
<?php
function full_str_pad($input, $pad_length, $pad_string = '', $pad_type = 0) {
$str = '';
$length = $pad_length - strlen($input);
if ($length > 0) { // str_repeat doesn't like negatives
if ($pad_type == STR_PAD_RIGHT) { // STR_PAD_RIGHT == 1
$str = $input.str_repeat($pad_string, $length);
} elseif ($pad_type == STR_PAD_BOTH) { // STR_PAD_BOTH == 2
$str = str_repeat($pad_string, floor($length/2));
$str .= $input;
$str .= str_repeat($pad_string, ceil($length/2));
} else { // defaults to STR_PAD_LEFT == 0
$str = str_repeat($pad_string, $length).$input;
}
} else { // if $length is negative or zero we don't need to do anything
$str = $input;
}
return $str;
}
$pad_me = "Test String";
echo '|'.full_str_pad($pad_me, 20, ' ')."|\n";
echo '|'.full_str_pad($pad_me, 20, ' ', STR_PAD_RIGHT)."|\n";
echo '|'.full_str_pad($pad_me, 20, ' ', STR_PAD_BOTH)."|\n";
?>
albert dot serra at camaleongroup dot com ¶
4 years ago
<?php
/** Description
* padclear, clear a pad varchar(9) "*****HOME" -> varchar(4) "HOME"
* _no use for INT_ : varchar(5) "00100" -> int(3) "100", use $number = (int) "00100";
*
* @param string, string original
* @param char, character to replace
* @param charreplace, final character
* @param type, [STR_PAD_RIGHT|STR_PAD_LEFT] see str_pad
* @return string, transformed string with charreplace
*/
function padclear($string, $char, $charreplace = null,$type = STR_PAD_RIGHT) {
$strlen = strlen($string) - 1;
$i = ($type == STR_PAD_RIGHT) ? 0 : $strlen;
$stop = ($type == STR_PAD_RIGHT) ? $strlen : 0;
$difpos = null;
while(is_null($difpos) && $i != $stop) {
$difpos = ($string[$i] != $char) ? $i : null;
if($type == STR_PAD_RIGHT) $i++;
else $i--;
}
if($type == STR_PAD_RIGHT) {
$ant = str_replace($char,$charreplace,substr($string,0,$difpos));
$nxt = substr($string,$difpos,$strlen);
} else {
$ant = substr($string,0,$difpos);
$nxt = str_replace($char,$charreplace,substr($string,$difpos,$strlen));
}
return $ant . $nxt;
}
$string = "HOME*******";
echo padclear($string,'*','',STR_PAD_LEFT); // HOME
$string = "*****HOME";
echo padclear($string,'*','',STR_PAD_RIGHT); // HOME
?>
Fahad dot Gilani at anu dot edu dot au ¶
10 years ago
Basically, *all* of you guys have a 'long' way of padding text with html tags (which includes ) You dont even have to do a str_replace... try the following code and this will work with ANY html tag there is out there and you don't have to worry about tag character lengths so on and so forth:
<?
$text = "This is pretty interesting!";
$pad_string = " ";
//Pad text on both sides
$text = str_pad($text, strlen($text)+(20*strlen($pad_string)), $pad_string, STR_PAD_BOTH);
print $text." Dont you think?";
?>
Will produce:
This is pretty interesting! Dont you think?
Cheers,
Fahad
no dot spam at no dot spam dot no ¶
10 years ago
there could already be spaces in the string.
1) strlen the string
2) replace spaces with "AUniqueString"
3) strlen the new string
4) compare the two strlen's
5) pad as needed considering the new strlen
6) finally, replace all "AUniqueString" 's with 's
hack & a half, slow as well i bet
mreilly at NOSPAM dot mac dot com ¶
10 years ago
When provided with a string of characters as the pad value, str_pad uses all the characters as fill, and can leave partial strings. (eg. If the pad value is 'ABC' and it needs 5 characters to pad with, it outputs 'ABCAB'.) This is a problem when you want to pad with non-breaking spaces, the code for which is 6 characters long.
This can be resolved by first padding the string with a single character that won't be found in the strings such as * then doing a str_replace of * with .
pestilenc at hotmail dot com ¶
10 years ago
For me this worked.
$string = 'help';
#First, str_pad() with unique character.
$string = str_pad($string, 10, "*", STR_PAD_BOTH);
#$string = '***help***';
#Second, str_replace with ' '
$string = str_replace("*", " ", $string);
no_email at php dot net ¶
10 years ago
To convert your string couldnt you just use strval($var)?
What if you want non-breaking spaces? If I try to str_pad with " " PHP thinks my padding string is 6 characters, whn in HTML it is only one.
matthew dot somerville at trinity dot oxford dot ac dot uk ¶
11 years ago
I find:
$mystr = substr("0000$mystr",-4)
(where the 0s are padding characters and -4 is the negative of the maxlength to pad to) is even simpler.
sergey ¶
1 year ago
You can use trim functions for clearpad string:
ltrim("0001230", "0") -> 1230
rtrim("0123000", "0") -> 0123
trim("0012300") -> 123
goellerk at bucks dot edu ¶
2 years ago
Apparently, as of 5.3.2 the notations "STR_PAD_LEFT" and "STR_PAD_RIGHT" are case sensitive.
$yr = "10";
$yr = str_pad($yr,2,'0',str_pad_left);
print "yr = '$yr'";
yr = ' '
$yr = "10";
$yr = str_pad($yr,2,'0',STR_PAD_LEFT);
print "yr = '$yr'";
yr = '10'
Charles ¶
6 years ago
More corrections to the original flap / Tomek Krzeminski code below (well someone has to check it!) -- the code is a bit mangled but it is still the same:
<?php
function mb_str_pad($ps_input, $pn_pad_length, $ps_pad_string = " ", $pn_pad_type = STR_PAD_RIGHT, $ps_encoding = NULL) {
$ret = "";
if (is_null($ps_encoding))
$ps_encoding = mb_internal_encoding();
$hn_length_of_padding = $pn_pad_length - mb_strlen($ps_input, $ps_encoding);
$hn_psLength = mb_strlen($ps_pad_string, $ps_encoding); // pad string length
if ($hn_psLength <= 0 || $hn_length_of_padding <= 0) {
// Padding string equal to 0:
//
$ret = $ps_input;
}
else {
$hn_repeatCount = floor($hn_length_of_padding / $hn_psLength); // how many times repeat
if ($pn_pad_type == STR_PAD_BOTH) {
$hs_lastStrLeft = "";
$hs_lastStrRight = "";
$hn_repeatCountLeft = $hn_repeatCountRight = ($hn_repeatCount - $hn_repeatCount % 2) / 2;
$hs_lastStrLength = $hn_length_of_padding - 2 * $hn_repeatCountLeft * $hn_psLength; // the rest length to pad
$hs_lastStrLeftLength = $hs_lastStrRightLength = floor($hs_lastStrLength / 2); // the rest length divide to 2 parts
$hs_lastStrRightLength += $hs_lastStrLength % 2; // the last char add to right side
$hs_lastStrLeft = mb_substr($ps_pad_string, 0, $hs_lastStrLeftLength, $ps_encoding);
$hs_lastStrRight = mb_substr($ps_pad_string, 0, $hs_lastStrRightLength, $ps_encoding);
$ret = str_repeat($ps_pad_string, $hn_repeatCountLeft) . $hs_lastStrLeft;
$ret .= $ps_input;
$ret .= str_repeat($ps_pad_string, $hn_repeatCountRight) . $hs_lastStrRight;
}
else {
$hs_lastStr = mb_substr($ps_pad_string, 0, $hn_length_of_padding % $hn_psLength, $ps_encoding); // last part of pad string
if ($pn_pad_type == STR_PAD_LEFT)
$ret = str_repeat($ps_pad_string, $hn_repeatCount) . $hs_lastStr . $ps_input;
else
$ret = $ps_input . str_repeat($ps_pad_string, $hn_repeatCount) . $hs_lastStr;
}
}
return $ret;
}
?>
private dot email at optusnet dot com dot au ¶
7 years ago
I wrote these 3 functions that live in a library i include in every programme. I find them useful, and the syntax is easy.
<?php
$str = "test";
function str_pad_right ( $string , $padchar , $int ) {
$i = strlen ( $string ) + $int;
$str = str_pad ( $string , $i , $padchar , STR_PAD_RIGHT );
return $str;
}
function str_pad_left ( $string , $padchar , $int ) {
$i = strlen ( $string ) + $int;
$str = str_pad ( $string , $i , $padchar , STR_PAD_LEFT );
return $str;
}
function str_pad_both ( $string , $padchar , $int ) {
$i = strlen ( $string ) + ( $int * 2 );
$str = str_pad ( $string , $i , $padchar , STR_PAD_BOTH );
return $str;
}
echo str_pad_left ( $str , "-" , 3 ); // Produces: ---test
echo str_pad_right ( $str , "-" , 3 ); // Produces: test---
echo str_pad_both ( $str , "-" , 3 ); // Produces: ---test---
?>
Hope this can help someone!
tacomage at NOSPAM dot devilishly-deviant dot net ¶
8 years ago
If you want to pad a string to a certain screen length with or other HTML entities, but don't want to risk messing up any HTML characters inside the string, try this:
<?php
function str_pad_as_single($input, $len, $pad, $flag=STR_PAD_RIGHT)
{
$trans=array('$'=>$input,' '=>$pad);
$output=str_pad('$',$len-strlen($input)+1,' ',$flag);
$output=strtr($output,$trans);
return $output;
}
echo str_pad_as_single('<img src="some.gif">',22,' ');
// will output <img src="some.gif">
echo str_pad_as_single('<img src="some.gif">',22,' ',STR_PAD_BOTH);
// will output <img src="some.gif">
echo str_pad_as_single('<img src="some.gif">',22,' ',STR_PAD_LEFT);
// will output <img src="some.gif">
?>
It works by using single characters for str_pad, then replacing the characters with the full strings using strtr, so the two strings can't interfere with each other. It also conveniently has the same syntax as str_pad. Yes, I realize that spacing an image with text isn't the best idea, but it's just an example, it'll apply to other HTML as well :-P
giorgio dot balestrieri at mail dot wind dot it ¶
9 years ago
For number formatting (like writing numbers with leading zeroes etc.) , sprintf is much faster than str_pad.
Consider the following snippet (it take some minutes to run):
<?php
echo "str_pad test started, please wait...\n";
$intStart = time();
for ($idx = 1; $idx <= 10000000; $idx++)
$strFoo = str_pad($idx, 10, "0", STR_PAD_LEFT);
$intEnd = time();
echo "str_pad cycle completed in " . ($intEnd - $intStart) . " seconds\n";
echo "sprintf test started, please wait...\n";
$intStart = time();
for ($idx = 1; $idx <= 10000000; $idx++)
$strFoo = sprintf("%010d", $idx);
$intEnd = time();
echo "sprintf cycle completed in " . ($intEnd - $intStart) . " seconds\n";
?>
The str_pad cyle runs 80-100% slower on my pc...
cd579 at hotmail dot com ¶
10 years ago
Why not just use a space[' '] instead of a character that COULD be inside the string, and risk messing it up? Example:
$string = 'test';
$string = str_pad($string, 10, " ", STR_PAD_BOTH);
// $string now equals ' test'
$string = str_replace(" ", " ", $string);
jared at dctkc dot com ¶
11 years ago
matthew.somerville's code did NOT work for me.
neither did bert@catsburg.com's.
neither did any other documentation.
(if I isolated the code by itself, they all worked; but in the context I was using it, $value was numeric, and there is NO WAY to force it to be a string in PHP).
I had to roll my own. I used 'trim' to _force_
the value of $value to be string, because as
long as PHP thought it was numeric, I could
not use any form of left-padding with zeros.
This worked (I use sprintf to left-pad
$value with zeros to a length of 4):
sprintf("%04s",trim($value));
hernanc ¶
4 years ago
To get Monday and Sunday's dates of the current week in Y-m-d format do:
<?php
$mon_date = date('Y-m-d',strtotime(date('Y') . 'W' . str_pad(date('W'), 2, '0',STR_PAD_LEFT) .'1'));
$sun_date = date('Y-m-d',strtotime(date('Y') . 'W' . str_pad(date('W'), 2, '0',STR_PAD_LEFT).'7'));
?>
rafaeljaquestudojunto at gmail dot com ¶
6 years ago
Looking forward to make some dynamic tabulation, i've noticed that the output appeared twice. I suppose that the parser recognize \t, \n and any other special character as a single character...
So.. If you need 4 tabulatins, just make...
<?php
print str_pad('',4,"\t");
?>