Take an input string and apply the substr() method to get the specified portion of the string. Substr() if successful returns extracted part of the string, then returns false or failure or an empty string.If this parameter is not passed, then substr() will return the string starting at the start_position_of_string till the end.If length is negative, it refers to the start position and extracts length from the end of the input string.If length is positive, it refers to the start position and extracts length from the beginning of the string.It refers to the length of the string returned from the input string or, to put in t\other words, the length of the string that needs to be cut from an input string. string_length_to_cut: This parameter is optional and of integer type.0: If the length of the specified string is 0, it will start at the first character of the input string.
Negative number: If the length of the specified string is a negative integer, a returning string will start from a specified position from the end of the string.Positive number: If the length of the specified string is a non-negative integer, a returning string will start from a specified position of the input string.The parameter’s data type is an integer hence, the integer can be positive, negative, or even 0. It refers to the position of the input string from where part of the string needs to be cut. starting_position_of_string: It is also the mandatory parameter to be passed to the substr() method.
It is the mandatory parameter to be passed and specifies a string to be one or more characters.
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