In this PHP tutorial, I will discuss how to remove special character from strings in PHP using preg_replace
. Strings containing special characters may be vulnerable to security flaws, inconsistent data, or unfavorable results.
Sometimes, We need to get the result of an input string as a simple composition of alphabets and numbers and, want to remove all special characters from the string by using PHP preg_replace
method.
There are two options available to remove special characters from a string using PHP.
You can also check another tutorial of PHP strings:
preg_replace
PHP FunctionWe can remove special characters from a string using preg_replace
, As like naming it using a regular expression to remove special characters from a string.
preg_replace
PHP Function:$result = preg_replace($pattern, $replaceWith , $string);
The Parameters are:
function RemoveSpecialChar($value){ $result = preg_replace('/[^a-zA-Z0-9]/s','',$value); return $result; }
In this example, the regular expression /[^a-zA-Z0-9 ]/
matches any character that is not an uppercase letter, lowercase letter, digit, or space. Those characters will be removed from the string.
echo RemoveSpecialChar("does't happened ' ' test");
does t happened test
str_replace
PHP FunctionThe str_replace
function in PHP is a simple way to remove specific characters from a string. If we know what special characters we need to remove, we can use str_replace()
to get the same effect as the above script.
str_replace
PHP Function:$title = str_replace( array( '\'', '"', ',' , ';', '<', '>' ), ' ', $value);
function RemoveSpecialChapr($value){ $string = "Hello, @world!"; // Define an array of special characters to remove $specialChars = array("@", "!"); // Remove special characters using str_replace $cleanString = str_replace($specialChars, "", $string); echo "Source String: $string\n"; echo "Result String: $cleanString\n"; }
in the above code, We have created an array $specialChars
containing the special characters we want to remove. The str_replace
function then replaces these characters with an empty string, resulting in a sanitized version of the original string.
echo RemoveSpecialChar();
filter_var
PHP also provides filter_var
function, You can combine it with the FILTER_SANITIZE_STRING
filter to remove HTML tags and special characters from strings.
<?php $string = "<b>test</b> this & string!"; // Remove HTML tags and special characters using filter_var $cleanString = filter_var($string, FILTER_SANITIZE_STRING); echo "Original String: $string\n"; echo "Cleaned String: $cleanString\n";
FILTER_SANITIZE_STRING
removes HTML tags and special characters from the source string.
Removing special characters from strings in PHP is a common operation in web applications. You can use basic method str_replace
or preg_replace
, or advanced methods involving filter_var
and custom regular expressions to remove unwanted characters from strings.
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