How to remove spaces in string in php

php method to remove spaces in a string: 1. Use regular expressions to delete spaces in the middle of the string and remove spaces at the beginning and end of the string; 2. Use str_replace and strtr functions to delete spaces in the middle of the string; 3. Use the trim function to remove spaces from both ends of a string.

The operating environment of this article: windows7 system, PHP7.1 version, DELL G3 computer

3 methods to delete strings in php The space in the middle

The first way: use regular

The code is as follows:

<?php
echo preg_replace(&#39;# #&#39;, &#39;&#39;, &#39;ab     ab&#39;);
//输出 "abab"
?>

The second way: use the str_replace() function

code As follows:

<?php
echo str_replace(&#39; &#39;, &#39;&#39;, &#39;ab    ab&#39;);
//输出 "abab&#39;
?>

Third method: use strtr() function

The code is as follows:

<?php
echo strtr(&#39;ab    ab&#39;, array(&#39; &#39;=>&#39;&#39;));
// 输出 "abab"
?>

The strtr() function is a bit special in use, in essence:

The code is as follows:

<?php
strtr(&#39;ewb&#39;, &#39;web&#39;, &#39;123&#39;) ==
strtr(&#39;ewb&#39;, array(&#39;e &#39;=> &#39;2&#39;, &#39;w&#39; => &#39;1&#39;, &#39;b&#39; => &#39;3&#39;)) ==
str_replace(array(&#39;e&#39;, &#39;w&#39;, &#39;b&#39;), array(&#39;2&#39;, &#39;1&#39;, &#39;3&#39;), &#39;ewb&#39;);
?>

The fourth way: use the encapsulated function

The code is as follows:

function trimall($str)//删除空格
{
    $qian=array(" ","　","\t","\n","\r");
    $hou=array("","","","","");
    return str_replace($qian,$hou,$str); 
}

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How to remove the leading and trailing spaces of a string in PHP

The first method: through the function that comes with PHP

<?php
/*
trim 去除一个字符串两端空格，
rtrim 是去除一个字符串右部空格，
ltrim 是去除一个字符串左部空格。
*/
?>
<?php
echo trim(" 空格 ")."<br>";
echo rtrim(" 空格 ")."<br>";
echo ltrim(" 空格 ")."<br>";
?>

The second method: replace by regular expression, more powerful

php removes spaces at the beginning and end of the string (including full-width)

The code is as follows:

<?
$str="　　　 　脚本之家 www.jb51.net 　　　　";
$str = mb_ereg_replace(&#39;^(　| )+&#39;, &#39;&#39;, $str);
$str = mb_ereg_replace(&#39;(　| )+$&#39;, &#39;&#39;, $str);
echo mb_ereg_replace(&#39;　　&#39;, "\n　　", $str);
?>

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