PHP String Exercise: Check whether a string contains a specific string - w3resource
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PHP Exercises: Convert the last 3 characters of a given string in upper case - w3resource
Replace some characters with Asterisks in PHP using str_repeat(). | by Olususi Kayode Oluyemi | Medium
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javascript - How can I get last characters of a string - Stack Overflow
PHP Strings - AlphaCodingSkills
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arrays - Character in php takes 3 places - Stack Overflow
PHP String Exercise: Get the characters after the last '/' in an url - w3resource
PHP Substring Examples - Dot Net Perls
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javascript - How can I get last characters of a string - Stack Overflow
In PHP remove last character from string if comma - Tutorials Bites
PHP strpos() Function: locating a substring within a string
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Palindromes in PHP – AntPace.com
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javascript - How can I get last characters of a string - Stack Overflow
How to Get First and Last Character from String in PHP? - ItSolutionStuff.com
PHP Exercises: Convert the last 3 characters of a given string in upper case - w3resource
