What are the ways to remove spaces in strings in php

php methods to remove spaces in strings are: 1. Use regular expressions to remove spaces, such as [preg_replace('# #', '', 'ab ab')]; 2. Use the str_replace function Remove spaces; 3. Use the wrapper function to remove spaces.

The method is as follows:

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1. Regular Expression

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

2. Use str_replace function

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

3. Use encapsulation function

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

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