The function returns the substring specified by the start and length parameter. We can also specify the length of the substring, and this parameter is optional. substr in PHP is a built-in function used to extract a part of the given string. This function allows us to extract the string from the given string by specifying the position at which the function begins to extract the substring. To extract the substring from the input string, PHP offers an in-built feature substr() function. In this lesson, we have discussed how to extract substrings from the string in PHP. In the given example, we have specified the negative value for the length parameter within the substr() function. We can also specify the negative value for the length parameter. Tonight Example: Using substr() function with negative length The function returns the string which is at the seventh index from the end of the string. In the given example, we have specified the negative index for the extracted string. Studytonight Example: Using substr() function with negative value So the output string will start from the index 11 and end at the end of the string. In the even example, we have used the substr() function but do not specify the length of the extracted string. To Example: Using substr() function will default length argument The substring starts with the index 8 and the length of the string is 2. In the given example, we have used the substr() function to extract the substring from the input string. $length specifies the length of the extracted string. It specifies the position at which the function begins to extract the substring. $start specifies where to start the string the needs to be extracted. In the first parameter, we have to specify the input string and the second parameter specifies the position at which the function begins to extract the substring from the input string, and the third-string specifies the length of the characters that are to be extracted from the input string. Out of three parameters, the first two parameters are necessary to specify while the third one is optional. This function takes three parameters that are string, start length, and the length of the extracted string. This function is used to extract the substring from any given string. On the other hand, if you need to know the position of the first occurrence of the substring in the string, or if you need to extract the substring itself, then strpos() is the better choice.The substr() function is a pre-defined PHP function. This function returns the substring from the first occurrence to the end of the string, which is all you need if you only care about the presence of the substring. If you only need to check if a substring is present in a string, and you don’t need to know its position or extract it, then strstr() is a good choice. The answer depends on your specific use case. Now that we know about the strpos() and strstr() functions, you might be wondering which one you should use. If you want to perform a case-insensitive search, you can use stripos() or stristr() functions instead of strpos() or strstr(), which work in absolutely the same way, but without case sensitivity. Note that both of the functions we just went over are case-sensitive. Once again, if strstr() returns anything other than false, it means that the substring is present in the string. In the above code, we’re checking if the string $string contains the substring $substring. $string = "Hello, world!" $substring = "world" if ( strstr ($string, $substring)) If the substring is not found, it returns false. The strpos() function, short for “string position,” returns the position of the first occurrence of a substring within a string. In PHP, the two best ways to check if a string contains a substring are by using the built-in strpos() and strstr() functions. By the time you’re done reading, you’ll have good knowledge of how to check strings for substrings in PHP, and you’ll be ready to use this skill in your own code. We’ll keep things simple and easy to understand, so even if you’re new to PHP, you’ll be able to follow along. Don’t worry if you’re not familiar with these functions yet - I’ll explain how to use them step by step and which one to go for. In this tutorial, I’ll show you how to do this using two functions: strpos() and strstr(). Whatever the reason, it’s a common task in PHP programming. Have you ever needed to check if a certain word or phrase is present in a larger string in your PHP code? Maybe you need to filter user input or perform a search on a website.
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