2.2 PHP Strings

strlen() - Return the Length of a String

The PHP strlen() function returns the length of a string.

Example 1: PHP String Functions - strlen() Return the Length of a String

Return the length of the string "Hello world!":

<?php
echo strlen("Hello world!"); // outputs 12
?>

str_word_count() - Count Words in a String

The PHP str_word_count() function counts the number of words in a string.

Example 2: PHP String Functions - str_word_count() Count Words in a String

<?php
echo str_word_count("Hello world!"); // outputs 2
?>

strrev() - Reverse a String

The PHP strrev() function reverses a string.

Example 3: PHP String Functions - strrev() Reverse a String

Reverse the string "Hello world!":

<?php
echo strrev("Hello world!"); // outputs !dlrow olleH
?>

strpos() - Search For a Text Within a String

The PHP strpos() function searches for a specific text within a string. If a match is found, the function returns the character position of the first match. If no match is found, it will return FALSE.

Example 4: PHP String Functions - strpos() Search For a Text Within a String

Search for the text "world" in the string "Hello world!":

<?php
echo strpos("Hello world!", "world"); // outputs 6
?>

Tip: The first character position in a string is 0 (not 1).

str_replace() - Replace Text Within a String

The PHP str_replace() function replaces some characters with some other characters in a string.

Example 4: PHP String Functions - str_replace() Replace Text Within a String

Replace the text "world" with "Dolly":

<?php
echo str_replace("world", "Dolly", "Hello world!"); // outputs Hello Dolly!
?>

Complete PHP String Reference

• For a complete reference of all string functions, go to W3Schools.com complete PHP String Reference.
• The PHP string reference contains description and example of use, for each function!