PHP Strings - AlphaCodingSkills
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php - Illegal string offset 'name' and Uninitialized string offset: 0 - Stack Overflow
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0' as a string with empty() in PHP - Stack Overflow
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PHP Regular Expression Exercise: Remove all characters from a string except a-z A-Z 0-9 or blank - w3resource
PHP Fatal error: Uncaught TypeError: Cannot access offset of type string on string in /usr/local/www/firewall_rules.php:805 | Netgate Forum
Generating a Timestamp in PHP – BrainBell
PHP Strings - java4coding
GitHub - hugsbrugs/php-string: PHP String Utilities
PHP Exercises: Remove the character in a given position of a given string - w3resource
