![]() If you are interested in learning more about PHP and web development, do not forget to check out Simplilearn’s Full-stack web development certification. In this substr in PHP tutorial, we learned about substr function, its use, and syntax. Negative Length and Positive Starting PositionĪdvance your career as a MEAN stack developer with the Full Stack Web Developer - MEAN Stack Master's Program. Positive Length and Negative Starting PositionĦ. Here are some examples to explain the use of these parameters: 1. If the parameter is not passed, then the function returns a string starting from starting_position till the end.If the length parameter is zero, null or False will be returned.Many characters are omitted from the end if the length passed is negative. If the length is negative, then the substring begins from the starting_position and extracts the length from the string's end.If the length is positive, then the substring includes the number of characters passed in this parameter beginning from the starting_position.length_of_substring: This is an optional parameter, and it is an integer value referring to the length of the string cut from the original one. ![]()
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