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Extract substring from the string in PHP using substr()
PHP Exercises: Count a substring of length 2 appears in a given string and also as the last 2 characters of the string - w3resource
Find a given substring in the string in PHP – BrainBell
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PHP : PHP Using RegEx to get substring of a string - YouTube
PHP substr() string function
How to Check If a String Contains a Substring in PHP - Maker's Aid
Check if string contains a substring with PHP | Beamtic
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PHP substr() function - w3resource
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