strlen

Returns the length of a string in bytes.

main.php

int

Returns the length of the string in bytes

On success:Length of the string as integer

On failure:0 if the string is empty

Returns the number of bytes rather than the number of characters in a string
For multibyte characters, use mb_strlen() instead for accurate character counting
Whitespace characters are counted as part of the string length
Null bytes (\0) are counted and do not terminate the string like in C

Variable

Checks whether a variable is an array.

validationtype-checksafety

Array

Counts all elements in an array or properties in an object that implements Countable.

countlengthsize

Variable

Determines if a variable is declared and is different than null.

checkvalidationsafety

Variable

Determines whether a variable is empty. A variable is considered empty if it does not exist or if its value equals false.

validationcheckinput

RegEx

Performs a regular expression match against a string and returns whether a match was found.

regexpatternvalidation

Security

Creates a password hash using a strong one-way hashing algorithm for secure password storage.

securitypasswordhash

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