The quotemeta() function is an inbuilt function in PHP which accepts a string as an argument and returns a string which has backslashes added in front of some predefined characters in a string.
The predefined characters are:
- period (.)
- backslash (\)
- plus sign (+)
- asterisk (*)
- question mark (?)
- brackets ()
- caret (^)
- dollar sign ($)
- parenthesis (())
Parameter: This function accepts only one parameter $string which is mandatory. This parameter specifies the string in which we want to add backslashes in front of the above mentioned predefined characters.
Return Value: It returns a string by adding backslashes in front of the predefined characters in the $string argument.
Input: $str = "geek$ for geeks?" Output: geek\$ for geeks\? Input: $str = "+geek* for geeks." Output: \+geek\* for geeks\.
Below programs illustrate the quotemeta() function in PHP:
Program 1: When string has ‘?’ and ‘$’ predefined characters
geek\$ for geeks\?
Program 2: When string has ‘*’, ‘.’ and ‘+’ predefined characters
\+geek\* for geeks\.
Program 3: When string has brackets and parenthesis as predefined characters.
\[\]geek for geeks\(\)
Program 4: When string has caret (^) as predefined character.
2 \^ 2 = 4