If $start has a negative value, the returned string starts from $start character position from the end of the string, and counting begins from -1.If $start has a positive value, the returned string starts from the $start position in the string, and counting begins from zero.The input is an integer and it has following conditions. $string is the second mandatory parameter in PHP substring function and it specifies the starting position from where the substring will be extracted. $string is a mandatory parameter in the PHP substring function and it takes the original string value to extract substring from a string in PHP. It specifies the string that needs to be changed or removed. The syntax of the substr() function contains three parameters, $string, $start and $length, in which the first two are mandatory, and the last one is optional. The PHP substring has the following syntax. Here we will discuss how to extract a substring from a string in PHP using Substr(). The PHP substring function accepts a string and returns a substring from the string. PHP substring, also known as PHP Substr(), is the most common PHP string function and it is used to extract a part of a string. PHP offers a variety of functions, including the PHP substring function, to make it easy to work with different data types.
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