![]() This parameter is optional since the default is to the end of the string.Ī positive number means that the length is to be returned from the start and a negative number shows the length to be returned from the end of the string. Length is a parameter that specifies the length of the returned string. We use a positive number to start from a specified position in the string, a negative number to start at a specified position from the end of the string, and 0(zero) to start at the first character in a string. Start specifies the position where the substring should be started. String is used to specifying the string whose part is to be extracted and returned. The substr() function performs and extraction of a substring from a string by cutting a part of a string from a string and returning the part of that string using the syntax below: The PHP substr() function is an in-built function of PHP which is used to extract a substring from a string. ![]() Throughout this article, we are going to understand the function used to extract a substring from a string, how to extract a substring from a string using different methods, and also study the importance of creating a substring when writing codes in PHP. Therefore, a substring is a series of characters that have been extracted from a string, This is because the words are not contiguous, meaning that they are not adjacent to each other in the positions within the string. What is a Substring?Ī substring is a subsequence of a string whose characters have been drawn from adjacent positions of the string.įor example, assuming the word KEYNOTE as our string, the word KEY can be derived from it as a substring.Īlso, the word KYNTE cannot be treated as a substring of the word KEYNOTE. In this post, we will share how you can extract a substring from a string in PHP.
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