PHP String Exercise: Print the next character of a specific character - w3resource
PHP substr() function - w3resource
Vowels Count in PHP | Count the Vowels of a given String using HTML Form and PHP - YouTube
pflag — Better parse command line flags in PHP | by Simon Tony | ITNEXT
How to Count a specified characters in a string in PHP - YouTube
GitHub - cp6/PHP-random-string-generator: PHP random string generator with options for length, character type and custom characters
Converting String to Array in PHP Using Different Methods
Reverse a String in PHP without using strrev() Method
Replace a portion of string by position in PHP – BrainBell
PHP Preg_Match() Function - Search A String For Pattern With Regular Expression Match
PHP Program to count the vowels, digits, and spaces in a string | T4Tutorials.com
PHP Exercises: Remove the character in a given position of a given string - w3resource
explode - Why do dollar symbols not appear in a double-quoted PHP string? - Stack Overflow
Repeat and Shuffle a String in PHP – BrainBell
PHP/Tutorials/Einstieg/Fehlerbehandlung – SELFHTML-Wiki
PHP String Function | Different Examples of String Function in PHP
DOC) PHP | cena ailen - Academia.edu
PHPyths Buster: A great string performance test! (updated) - Krzych Jończyk
PHP: Expects parameter to be string array given - Stack Overflow
Php - check if string is not empty or has a first character not equal to - Stack Overflow
PHP Regular Expression Exercise: Remove all characters from a string except a-z A-Z 0-9 or blank - w3resource
Php String And Regular Expressions
PHP Explode – How to Split a String into an Array
How to Reverse String in PHP | Custom Function - YouTube
