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GitHub - samiahmedsiddiqui/trim-php: Strip whitespace (or other characters) of a string.
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PHP rtrim() function - w3resource
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In PHP remove last character from string if comma - Tutorials Bites
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PHP Tutorial-String Manipulation
![rtrim(): Passing null to parameter #1 ($string) of type string is deprecated [#3273959] | Drupal.org](https://www.drupal.org/files/issues/2022-04-07/d9-sandbox.ddev_.site_.png "rtrim(): Passing null to parameter #1 ($string) of type string is deprecated [#3273959] | Drupal.org")
rtrim(): Passing null to parameter #1 ($string) of type string is deprecated [#3273959] | Drupal.org
Understanding Trim in PHP For Complex Programming
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PostgreSQL RTRIM() function - w3resource
PHP trim() function - Trim beginning and end of string (left and right trim) in PHP - YouTube
String Functions in PHP - Tech Fry
php - Unrecognized error number: 8192: trim(): Passing null to parameter #1 ($string) of type string is deprecated - Stack Overflow
PHP trim() Function - Coding Ninjas
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