PHP Data Types
PHP Exercises: Remove the character in a given position of a given string - w3resource
How to Count a specified characters in a string in PHP - YouTube
PHP Regular Expression Exercise: Remove all characters from a string except a-z A-Z 0-9 or blank - w3resource
PHP Strings - java4coding
Beginner guide of PHP Strings - DevOpsSchool.com
PHP Program to count the vowels, digits, and spaces in a string | T4Tutorials.com
explode - Why do dollar symbols not appear in a double-quoted PHP string? - Stack Overflow
GitHub - hugsbrugs/php-string: PHP String Utilities
PHP: Convert String to Number
PHPyths Buster: A great string performance test! (updated) - Krzych Jończyk
PHP Strings - AlphaCodingSkills
PHP String Exercise: Print the next character of a specific character - w3resource
7 PHP String Functions You Should Know and How To Use Them - Digital Owl's Prose
trim() in PHP | Tree Types of trim() in PHP You Need To Know
How to reverse string in PHP without using function? : r/codinginterview
PHP: Expects parameter to be string array given - Stack Overflow
How to change the string case? in PHP – BrainBell
The PHP File_Get_Contents() Function - Read File Into A String - PHP Tutorials
PHP Exercises: Count the number of strings with given length in given array of strings - w3resource
PHP String to Array Conversion । PHP Explode Function - YouTube
7 PHP String Functions You Should Know and How To Use Them | by Joshua Otwell | Level Up Coding
Type Casting in PHP | CodeAhoy
php - Illegal string offset 'name' and Uninitialized string offset: 0 - Stack Overflow
PHP Fatal error: Uncaught TypeError: Cannot access offset of type string on string in /usr/local/www/firewall_rules.php:805 | Netgate Forum
How to Reverse String in PHP | Custom Function - YouTube
Php - check if string is not empty or has a first character not equal to - Stack Overflow
