str_replace

Replaces all occurrences of search string with replacement string.

main.php

string|array

Returns a string or array with replaced values

On success:String or array with all occurrences of search replaced with replace

On failure:Original subject if search is not found

Replacement is case-sensitive, use str_ireplace() for case-insensitive replacement
Can accept arrays for search and replace parameters for multiple replacements
Replacements are performed left to right, may replace previously inserted values
Optional count parameter returns the number of replacements performed

String

Returns a string with whitespace (or other characters) stripped from the beginning and end of string.

cleanwhitespacesanitize

Security

Converts special characters to HTML entities to prevent XSS attacks and ensure safe HTML output.

securityxsssanitize

Validation

Filters a variable with a specified filter, used for validating and sanitizing data.

validatesanitizesecurity

Array

Returns all values from an array with numeric keys, effectively reindexing the array.

valuesreindexclean

String

Translates characters or replaces substrings in a string using either character mapping or replacement pairs.

replacetranslatesubstitute

RegEx

Performs a regular expression search and replace operation on a string or array of strings.

regexpatternreplace