Functions in PHP8: New features of str_contains()

With the rapid development of the Internet, programming languages ​​are constantly updated and upgraded. As a commonly used programming language, PHP has also experienced countless improvements and enhancements. As the latest version, PHP8 not only introduces new features, but also upgrades many functions. Among them, the function str_contains() is a very useful new feature in PHP8.

String processing in PHP has always been a very important and basic piece of content, and the function str_contains() happens to be upgraded and improved in this field, providing more powerful functions for string processing.

First, let us look at the basic usage of str_contains(). Its function is very simple, it is used to determine whether a string contains the specified character or string. Before PHP7, we used the strpos() function to accomplish this task. However, this function has some limitations, because it can only determine whether the specified string appears in another string, but cannot determine whether the end of the specified string is another string.

In PHP8, the str_contains() function just solves this problem. It can determine whether the specified string appears in another string, and it can also determine whether the end of the specified string is another string.

The following is a sample code to better demonstrate the usage of str_contains():

$string1 = "Hello world";
$string2 = "world";

if (str_contains($string1, $string2)) {
    echo "字符串包含指定的字符或字符串";
} else {
    echo "字符串不包含指定的字符或字符串";
}

In this example, the function str_contains() is used to determine whether the variable $string1 contains the variable $ string2. If included, output "String contains the specified character or string", otherwise output "String does not contain the specified character or string".

In addition to basic usage, str_contains() can also be used with other functions to achieve more powerful string processing functions. For example, we can use it with the strlen() function to output the number of specified characters or strings in a string:

$string = "Learn PHP, it is easy and fun";
$substring = "PHP";

$count = substr_count($string,$substring);

echo "字符串中包含" . $count . "个'" . $substring . "'";

In this example, the function substr_count() is used to count the number in the string $string Specifies the number of substrings $substring, and then outputs the result. This method is very useful if we need to determine whether a string contains another string.

In addition to the above usage, str_contains() also supports the feature of ignoring case to better meet our needs. In PHP8, we can add a third parameter i to the function to achieve this feature. Here is a sample code:

$string1 = "Hello world";
$string2 = "World";

if (str_contains($string1, $string2, true)) {
    echo "字符串包含指定的字符或字符串(不区分大小写)";
} else {
    echo "字符串不包含指定的字符或字符串";
}

In this example, the third parameter i is used to ignore case, so regardless of the case of the string, the function will recognize it as the same string.

To sum up, the str_contains() function is a very practical and basic new feature in PHP8. Through its implementation, we can more conveniently determine whether a string contains another specified string. Moreover, with this function, we can also handle string-related tasks more conveniently, including calculating the number of specified characters or strings in a string. I believe that the practicality and flexibility of this function will play a great role in our daily programming.

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