What are the functions to delete blank spaces in php?

php functions to delete blank spaces are: 1. Use the "str_replace()" function to delete; 2. Use the "strtr()" function to delete; 3. Use the encapsulated function "trimall" to delete.

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

php What are the functions for deleting blank spaces? 3 ways to delete spaces in the middle of strings in php

The first one: use str_replace() function

The code is as follows:

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

The second one: use strtr() The code of function

is as follows:

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

strtr() function is a bit special to 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;);
?>

Third method: use The code of the encapsulated function

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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