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:

The second way: use the str_replace() function

code As follows:

Third method: use strtr() function

The code is as follows:

'')); // 输出 "abab" ?>

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

The code is as follows:

 '2', 'w' => '1', 'b' => '3')) == str_replace(array('e', 'w', 'b'), array('2', '1', '3'), 'ewb'); ?>

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

 "; echo rtrim(" 空格 ")."
"; echo ltrim(" 空格 ")."
"; ?>

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:

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