How to remove characters from a string in PHP

How can I strip unwanted characters / words from a PHP string? (Or, How can I remove or delete special characters from a PHP string?).

Remove characters from a string in php

function clean($string) {
   $string = str_replace(' ', '-', $string); // Replaces all spaces with hyphens.
   $string = preg_replace('/[^A-Za-z0-9\-]/', '', $string); // Removes special chars.

   return preg_replace('/-+/', '-', $string); // Replaces multiple hyphens with single one.
}

echo clean('a|"bc!@£de^&$f g');

Remove specific characters from string in php

str_replace php function is used to remove specific characters from a string in php.

$email = '[email protected]';
$email = str_replace('@', '[at]', $email);
$safe_display_email = str_replace('.', '[dot]', $email);

How to remove html special chars from string in php

htmlentities php function is ued to removr html special chars from a string in php.

$orig = "I'll \"walk\" the <b>dog</b> now";
$a = htmlentities($orig);
$b = html_entity_decode($a);
echo $a; // I'll &quot;walk&quot; the &lt;b&gt;dog&lt;/b&gt; now
echo $b; // I'll "walk" the <b>dog</b> now

Remove special characters from string except space in php

Replace all characters except letters, numbers, spaces and underscores. preg_replace php function is used to remove special characters from a string except space in php.

$string = preg_replace("/[^ \w]+/", "", $string);

Remove specific word from string in php

Delete particular word from string using php str_replace function.

$string = str_replace('Facebook', 'FB', $string);