PHP empty() string function
Empty string issue for strpos(), strrpos(), stripos(), strripos(), strstr(), strchr(), strrchr(), and stristr() · Issue #8582 · php/php-src · GitHub
0' as a string with empty() in PHP - Stack Overflow
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PHP empty Function with 3 Examples
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PHP Empty() Function
Support for php stan types (for example non-empty-string) · Issue #2152 · bmewburn/vscode-intelephense · GitHub
Php - check if string is not empty or has a first character not equal to - Stack Overflow
php - There is an empty value given as standard value on my input field, I don't know where it come from - Stack Overflow
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regex101: Not Empty String
PHP Implode() Function - Join Array Elements Into A String
