What is the purpose of the substr() function in PHP?

To extract a substring from a string
To concatenate two strings
To convert a string to uppercase
To remove leading and trailing whitespace

The substr() function in PHP is used to extract a substring from a string. It takes the string and the starting position as parameters and optionally the length of the substring. This function is commonly used for manipulating strings and extracting specific portions of text. Learn more: http://php.net/manual/en/function.substr.php

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