![]() The PHP strpos() function returns the index of the first occurrence of a substring within a string. Introduction to the PHP strpos() function Simplilearn also offers a learning platform called SkillUp, where learners can take up free courses that are self-paced and have been created by top practitioners and industry experts and learn some amazing in-demand skills.Summary: in this tutorial, you’ll learn how to use the PHP strpos() function to get the index of the first occurrence of a substring in a string. If you are interested in learning more about PHP and web development, don't forget to check out Simplilearn’s full-stack web development certification. We have tried to detail the examples and showed you some corner cases. In this article, we saw the strpos in PHP function, its use, and syntax. Here is an example to work with a case sensitive function:Īdvance your career as a MEAN stack developer with the Full Stack Web Developer - MEAN Stack Master's Program. ![]() starting_position (optional)- It is the position of the original string from where the function starts searching the original string.search_string (also required)- This parameter is the substring that we need to search in the original string.original_string (required)- This parameter includes the original string in which we need to search the substring. ![]() The strpos in php have three parameters, out of which one is optional, and two are mandatory. Here, strpos in php matches the first “i" it comes across, i.e., in "This." However, 'i' is also present in 'in,' so if we want to get its index, we can specify where to start searching. Now, let us try to find “i” in this string using this script: Rather than using = in PHP, if we use =, then PHP will check the value of 0 and false and find that it is not a match because the latter is a Boolean and the former is an integer. This issue can be resolved using the '=' operator called 'is identical to.' If search_string is false, it must be equal to and as of the same type as the Boolean false. PHP considers 0 to be false, which means that it can't differentiate between substring found at index 0 and substring not found. “This” is the first thing in the string which means the strpos in PHP will return index 0. When we try to execute this script, the output is ‘Error’ despite ‘This’ is clearly in the given string. However, let's see what happens when the substring is not found in the string using this script: strpos in PHP returns the first occurrence of that word in the string then, i.e., the index of the first letter of the matched word. ![]() Note: PHP considers the first character of the string to be at index 0, which means that the 'i’ strpos() found is the eighth character.Īs shown in the first example, we can specify the whole word as the parameter too. The output is 7 because the first character in “strpos in PHP" is a lowercase 'i’ is at index 7. Let's look at the syntax of the function. In other words, the strpos in PHP is used to find numeric index of needle's occurrence in the haystack string. It is interesting to note that the function is binary-safe. The upper-case and lower-case characters are treated differently as the function is case-sensitive.įor example, if you want to find the position ‘php’ in the string ‘strpos in php’, use the following:Īs mentioned above, the function of strpos function is to find the first occurrence of a string inside some other string. The function returns an integer value which is the index of the first occurrence of the string. Its use is to find the first occurrence of a substring in a string or a string inside another string.
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