Example of a PHP replacement that filters all whitespace characters and spaces

In PHP, the TRIM function can only replace the left and right sides of the space, feeling in some cases not very good, if you want to be a string of all white space characters filter out (spaces, full-width spaces, newline, etc.), then we can write a filter function.

PHP Learning Str_replace functions are known, can be batch replacement, so we can use the following source code implementation to replace filter a string of all white-space characters.

PHP Source Reference:

<?php
$str = ' Jkgsd
Gsgsdgs GSDG GSD ';
echo Mytrim ($STR);
function Mytrim ($STR)
{
$search = Array ("", "", "\ n", "\ r", "T");
$replace = Array ("", "", "", "", "");
Return Str_replace ($search, $replace, $STR);
}
?>

Run code, page output: JKGSDGSGSDGSGSDGGSD, perfect to achieve the effect we want.

To do this, you can use a regular expression of PHP to complete the

The following example can remove the extra whitespace

<?php

$STR = "This line contains\tliberal \ r \ n whitespace.\n\n";

The leading/trailing whitespace

Remove the start and end blanks

$str = Trim ($STR);

Now remove any doubled-up whitespace

To take the rest of the space and squeeze it in.

$str = Preg_replace ('/\s (? =\s)/', ', $str);

Finally, replace any non-space whitespace and a space

Finally, remove the blank space, using a space instead

$str = preg_replace ('/[\n\r\t]/', ', ', $str);

Echo out: ' This line contains liberal the use of whitespace. '

echo "<pre>{$str}</pre>";

?>

This example strips out the extra whitespace characters

<?php
$str = ' foo o ';
$str = preg_replace ('/\s\s+/', ', ', $str);
will be changed to ' foo o '
Echo $str;
?>