How to Check if a String Begins with a Specific Substring in PHP?

Determining if a String Begins with a Specified Substring

In various programming scenarios, verifying if a string starts with a specific substring becomes necessary. Let's consider two examples provided:

Example 1:

$string1 = 'google.com';

Question: How can we determine if $string1 starts with "http"?

Answer:

Using str_starts_with function for PHP 8 and above:

str_starts_with($string1, 'http'); // false

Using substr function for PHP 7 or older:

substr($string1, 0, 4) === "http"; // false

Example 2:

$string2 = 'http://www.google.com';

Question: How can we check if $string2 begins with "http"?

Answer:

Using str_starts_with function for PHP 8 and above:

str_starts_with($string2, 'http'); // true

Using substr function for PHP 7 or older:

substr($string2, 0, 4) === "http"; // true

In general, for any string $string and a substring $query, you can use the following logic using substr:

substr($string, 0, strlen($query)) === $query

The above is the detailed content of How to Check if a String Begins with a Specific Substring in PHP?. For more information, please follow other related articles on the PHP Chinese website!