PHP Program to count the vowels, digits, and spaces in a string | T4Tutorials.com
PHP Strings - java4coding
php - Illegal string offset 'name' and Uninitialized string offset: 0 - Stack Overflow
Split, tokenize, and iterate a string in PHP – BrainBell
regex - URL string compare not working in php - Stack Overflow
7 PHP String Functions You Should Know and How To Use Them | by Joshua Otwell | Level Up Coding
explode - Why do dollar symbols not appear in a double-quoted PHP string? - Stack Overflow
Vowels Count in PHP | Count the Vowels of a given String using HTML Form and PHP - YouTube
PHP Split String | Working of the PHP Split String with Examples
Pattern Matching with preg_match and preg_match_all in PHP – BrainBell
What's New In PHP 7.4 | TechnoLush
How to change the string case? in PHP – BrainBell
Find positions of a substring in a string in PHP – BrainBell
Reverse a String in PHP without using strrev() Method
PHP: Expects parameter to be string array given - Stack Overflow
PHP Data Types
Converting String to Array in PHP Using Different Methods
PHP: Convert String to Number
PHP Strings - AlphaCodingSkills
7 PHP String Functions You Should Know and How To Use Them - Digital Owl's Prose
GitHub - heavenshell/php-string-filter: Porting p5-string-filter to PHP
PHP Preg_Match() Function - Search A String For Pattern With Regular Expression Match
PHPyths Buster: A great string performance test! (updated) - Krzych Jończyk
