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#Php string contains unacceptable value how to#

Regular expressions can be used in many cases, for example, they can be used to validate form inputs that we have used here for searching. $string = "This is a test text to PHP string contains." īy using regular expressions, you can easily have more control over the search term.

#Php string contains unacceptable value how to#

Using this method, you can have more control over how to search, but its speed is lower than the above methods. 3- Check PHP string contains by Regular expressionīy using regular expressions in PHP, it is possible to determine whether the string contains a substring or not.

Therefore, it is better to use the strops() function and convert the expressions (string and substring) to lowercase letters before checking. The drawback of this function is that if the search term is at the beginning of the string, the return value of the function will be false, while the substring is inside the string. To avoid this, we must either convert the term to lowercase before searching or use the stripos() function. Note: Return index in this function starts from 0 like arrays in PHP. start – Optional, specific where the search for the substring should begin.substring – Required, the substring that you are looking to check if the string contains.string – Required, the original string that you are looking to search.strripos(): aimed at detecting the position of a string’s last occurrence inside another string.stripos(): aimed at detecting the position of a string’s first occurrence inside another string.strrpos(): aimed at detecting the position of a string’s last occurrence inside another string.This function is considered case-sensitive and binary-safe. If the entered substring does not exist inside the main string, it returns false, and if it does, it returns its index.

The strops() function in PHP not only determines the existence of a substring within the main string but also the location of the first occurrence of the substring. $string = strtolower("This is a test text to PHP string contains.") To determine whether the string contains a substring or not, you must first convert both texts (string and substring) to lowercase letters and then perform the search operation. One thing to keep in mind is that this function is case-sensitive. If the string contains a substring, it returns true, otherwise, it returns false. $string = "This is a test text to PHP string contains."

substring – Required, the substring that you are looking to check if the PHP string containsĮxample of str_contains function $word = "text".

string – Required, the original string that you intend to search.

The str_contains() function is provided in PHP version 8 and determines if a string contains a given substring. The most common way to determine if the string contains a substring is to use the str_contains() function, but in addition to this function, we will discuss other functions and methods.īy using the methods presented in this post, in addition to checking the existence of a sub-string in the main string, we can also determine the placement index of the sub-string. For this, we need PHP string contains and its methods. For example, we want to search for a word in the text. Sometimes we need to check if a string is inside another string or not. Why do we need to find a string inside another string? There are various functions and methods to check the string contains substrings in PHP, which we will discuss step by step in this tutorial. In this PHP tutorial, we are going to check if a string is inside another string or not (find string in string).