How to remove spaces from string in php?

php method to remove spaces from a string: 1. Use the trim() function to remove spaces on both sides of the string; 2. Use the rtrim() and ltrim() functions to remove spaces on both sides of the string; 3. Use "str_replace(' ','', string)" to remove spaces from the string.

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Method 1: trim() or rtrim() and ltrim() function removes spaces at both ends of a string

trim() function removes whitespace characters or other predefined characters on both sides of a string.

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);
$str = " PHP去除字符串的空格! ";
echo "文本为：" . trim($str);
?>

ltrim() - Removes whitespace characters or other predefined characters on the left side of a string.

rtrim() - Removes whitespace characters or other predefined characters on the right side of the string.

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);
$str = " PHP去除字符串的空格! ";
echo "文本为：" . rtrim(ltrim($str));
?>

Method 2: Use str_replace() function to remove spaces

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

Method 3: Use strtr() function to remove spaces

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

Method 4: Use regular expressions to remove spaces

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

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