Use the str_ends_with() function in PHP8 to determine the end of a string

With the release of PHP8, new functions and features are constantly being introduced. One of the noteworthy functions is str_ends_with(). This function can be used to determine whether a string ends with a specific string, which is often used in actual development.

In this article, we will discuss the use of str_ends_with() function and some precautions. First, we need to understand the syntax structure of this function:

bool str_ends_with (string $haystack, string $needle)

This function accepts two parameters: $haystack and $needle. Among them, $haystack represents the string to be checked, and $needle represents the string to be queried. The return value of the function is a Boolean value, which returns true if $haystack ends with $needle, otherwise it returns false.

The following is an example of using the str_ends_with() function, which queries whether the $haystack string ends with "end":

$haystack = "This is the end";
$needle = "end";
if (str_ends_with($haystack, $needle)) {

echo "The string ends with 'end'";

} else {

echo "The string does not end with 'end'";

}
?>

Run the above code, the output will be "The string ends with 'end'". This is because the $haystack string does end with "end".

In addition to the end of the string, the str_ends_with() function can also be used to check the file extension. For example, we can use this function to check if the file name ends with ".php" to ensure that only PHP files are allowed to be uploaded. The following is a sample code like this:

$filename = "example.php";
if (str_ends_with($filename, ".php")) {

echo "The file is a PHP script";

} else {

echo "The file is not a PHP script";

}
?>

Note: The

1. str_ends_with() function is a new function added in PHP8 , cannot be used in lower versions of PHP. If you want to use this function, be sure to upgrade to PHP8 or higher.
2. When using the str_ends_with() function, please ensure that the value of the $needle parameter is not included in the $haystack string. Otherwise, the function will return incorrect results. For example, if the $needle string is "is" and the $haystack string is "This is the end", then the function will return true, which is obviously wrong.
3. str_ends_with() function is case-sensitive. For example, if the $haystack string is "Hello World" and the $needle string is "world", the function will return false. If case-insensitive matching is required, both parameters need to be converted to lowercase or uppercase before using this function.

Summary:

The str_ends_with() function is a convenient new function that can help us quickly and accurately determine the end of a string during string operations. In actual development, we can use it to check file extensions, check whether the URL address ends with a specific string, etc., making our program more robust.

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