PHP substr() function - w3resource
PHP Object to String | How to Convert Object to String in PHP?
Implementing find and replace functionality in PHP - Eduonix Blog
What Is a PHP Class? | Zend by Perforce
How to use PHP $_GET Global Variable - Pi My Life Up
PHP Strings: PHP String Functions Explained with Examples
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strpos in PHP: Syntax, Uses And Parameter Values (With Their Usecase)
strpos in PHP: Syntax, Uses And Parameter Values (With Their Usecase)
PHP - How to Loop through Characters in String?
PHP - Wikipedia
explode - Why do dollar symbols not appear in a double-quoted PHP string? - Stack Overflow
PHP String Exercise: Convert the value of a PHP variable to string - w3resource
Adam Cameron's Dev Blog: PHP: I find the PHP equivalent of <cfdump> on GitHub shortly after I package it myself
PHP: Convert String to Number
How to get variable value from URL query string in PHP? « Online Class Notes
String (computer science) - Wikipedia
How To Work with Strings in PHP | DigitalOcean
PHP Strings
Strings in PowerShell – Replace, compare, concatenate, split, substring – 4sysops
How to read user or console input in PHP ? - GeeksforGeeks
Beginner guide of PHP Strings - DevOpsSchool.com
PHP substr(): How to Extract a Substring from a String
Vowels Count in PHP | Count the Vowels of a given String using HTML Form and PHP - YouTube
PHP Array Exercise: Check whether all array values are strings or not - w3resource
