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String Functions
PHP Manual

# strlen

(PHP 4, PHP 5)

strlen — Get string length

### Description

int strlen ( string `$string` )

Returns the length of the given `string`.

### Parameters

`string`

  The string being measured for length.

### Return Values

The length of the `string` on success, and 0 if the `string` is empty.

### Changelog

Version | Description
--- | ---
5.3.0 | Prior versions treated arrays as the string Array, thus returning a string length of 5 and emitting an `E_NOTICE` level error.

### Examples

Example #1 A strlen() example

`<?php
$str = 'abcdef';
echo strlen($str); // 6
$str = ' ab cd ';
echo strlen($str); // 7
?>`

### Notes

> Note:

> strlen() returns the number of bytes rather than the number of characters in a string.

> Note:

> strlen() returns `NULL` when executed on arrays, and an `E_WARNING` level error is emitted.

### See Also

- count() - Count all elements in an array, or something in an object
- grapheme_strlen() - Get string length in grapheme units
- iconv_strlen() - Returns the character count of string
- mb_strlen() - Get string length

stristr
strnatcasecmp
String Functions
PHP Manual