Php: How to delete spaces in the middle of a string _ PHP Tutorial

In php, there are three methods to delete spaces in the middle of a string. First, use the regular expression to copy the code as follows :? Phpechopreg_replace (##,, abab); output abab? Type 2: Use the str_replace () function to copy the code as follows :? First: use regular expressions

The code is as follows:

Echo preg_replace ('#', '', 'AB ');
// Output "abab"
?>

Method 2: Use the str_replace () function

The code is as follows:

Echo str_replace ('','', 'AB AB ');
// Output "abab'
?>

Third: use the strtr () function

The code is as follows:

Echo strtr ('AB AB', array (''=> ''));
// Output "abab"
?>

Strtr () functions are used in a special way, essentially:

The code is as follows:

Strtr ('ewb ', 'web', '20140901') =
Strtr ('ewb ', array ('E' => '2', 'W' => '1',' B '=> '3') =
Str_replace (array ('e', 'W', 'B'), array ('2', '1', '3'), 'ewb ');
?>

Type 4: Use encapsulated functions

The code is as follows:

Function trimall ($ str) // delete spaces
{
$ Qian = array ("", "", "\ t", "\ n", "\ r ");
$ Hou = array ("","","","","");
Return str_replace ($ qian, $ hou, $ str );
}

The pipeline code is as follows :? Php echo preg_replace ('#', '', 'AB AB'); // output" abab "? Type 2: Use the str_replace () function code as follows :?...