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PHP File Open/Read/Close - W3Schools
PHP: readfile - Manual
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6 Ways to Read Files In PHP - Into String, Array, And More!
Quick Tip: How To Read a Local File with PHP — SitePoint
PHP File Open: A Guide to Reading and Writing Files in PHP
Write to Files and Read Files With PHP | Envato Tuts+
PHP: file_get_contents - Manual
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How to read a web page in PHP? - Stack Overflow
The PHP Handbook – Learn PHP for Beginners - freeCodeCamp.org
Reading .csv file in php - Stack Overflow
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PHP readfile() Function - W3Schools
PHP: Directory::read - Manual
PHP - Wikipedia
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How to Parse JSON in PHP | Envato Tuts+
How to read user or console input in PHP - GeeksforGeeks