How to clear spaces in php

php method to remove spaces: first use the "trim" function to remove leading and trailing spaces; then use "preg_replace" to remove more than two spaces; finally replace non-spaces with one space.

php To remove spaces, you need to use the string replacement function and the regular replacement function

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 the non-space with a space

Use the above example to remove all excess 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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