How to remove all spaces in php

php method to remove all spaces: first create a PHP sample file; then use the "trim($str);" method to remove leading and trailing spaces; finally use the "preg_replace" expression to remove all spaces.

The operating environment of this article: Windows 7 system, PHP version 7.1, DELL G3 computer

php To remove spaces, you need to replace them with strings Functions and regular replacement functions

Remove spaces in the string str_replace(' ','',$cat_name)

$str = ” This line contains\tliberal \r\n use of  whitespace.\n\n”;
$str = trim($str);// 首先去掉头尾空格
$str = preg_replace(’/\s(?=\s)/’, ‘’, $str);// 接着去掉两个空格以上的
$str = preg_replace(’/[\n\r\t]/’, ‘ ‘, $str);//

Finally replace non-spaces with a space

Use the above example to remove all extra spaces.

First use TRim() to remove leading and trailing spaces,

Then use preg_replace() to remove repeated spaces. The (?=) in

means that only the following spaces and the preceding spaces will be matched.

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