What is the function to intercept string in php

PHP provides a variety of string interception functions: substr(): intercepts the specified part of the string. substring(): intercept a substring from the end of the string to the beginning. substr_replace(): Replace the specified part of the string. str_replace(): Replace the specified part of the string with other parts.

Function to intercept strings in PHP

PHP provides a variety of functions to intercept strings, among which the most Commonly used ones include:

• substr(): Intercept a part of the string (substring) and return it. The syntax is: substr(string $string, int $start, int $length = null), where $start specifies the starting position of the substring, and $length specifies the length of the substring.

For example:

<code class="php">$string = "Hello World!";
$substring = substr($string, 0, 5); // "Hello"</code>

• substring(): The function is similar to substr(), but it intercepts sub-characters from the end of the string to the starting position string. The syntax is: substring(string $string, int $start, int $length = null), where $start specifies the starting position of the substring, and $length specifies the length of the substring.

For example:

<code class="php">$string = "Hello World!";
$substring = substring($string, 10, 5); // "World"</code>

• substr_replace(): Replace a part of the string with the specified string. The syntax is: substr_replace(string $string, string $replacement, int $start, int $length = null), where $start specifies the starting position of replacement and $length specifies the length of replacement.

For example:

<code class="php">$string = "Hello World!";
$substring = substr_replace($string, "there", 7, 5); // "Hello there!"</code>

• str_replace(): Replace some parts of the string with other parts. The syntax is: str_replace(mixed $search, mixed $replace, mixed $subject), where $search specifies the part to be replaced, $replace specifies the replaced part, and $subject specifies the target string.

For example:

<code class="php">$string = "Hello World!";
$substring = str_replace("World", "there", $string); // "Hello there!"</code>

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