Function to intercept string in php-PHP Tutorial-php.cn

Function to intercept string in php

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Release： 2024-04-29 09:30:24

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PHP uses the substr() and mb_substr() functions to intercept strings. The former is suitable for single-byte characters, and the latter supports multi-byte characters. Usage: substr(string, starting position, length); mb_substr(string, starting position, length, encoding). Example: intercept the first 5 characters: substr("Hello World", 0, 5); intercept starting from the 6th character: substr("Hello World", 5); intercept the middle part: substr("Hello World", 2 , 4); Processing multi-byte characters: mb_substr("Hello World",

Function to intercept string in php

PHP function to intercept strings

Goal: Intercept the specified part of the string

Function:

substr()
mb_substr() (multi-byte characters)

Usage:

substr( )

<code class="php">substr($string, $start, $length);</code>

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$string：The string to be intercepted
$start：Interception starting position (0 means start )
$length: Intercept length (optional, intercepted to the end of the string by default)

mb_substr()

<code class="php">mb_substr($string, $start, $length, $encoding);</code>

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$string：The string to be intercepted
$start：Interception starting position (0 means start)
$length: Intercept length (optional, default is to intercept to the end of the string)
$encoding: Character encoding (optional, default is UTF-8)

Example:

Intercept the first 5 characters of the string:

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

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Intercept the string from Starting from the 6th character:

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

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Intercept the middle part of the string:

<code class="php">$string = "Hello World";
$result = substr($string, 2, 4); // "llo "</code>

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Use mb_substr to process multi-byte characters:

<code class="php">$string = "你好世界";
$result = mb_substr($string, 0, 3, "UTF-8"); // "你好"</code>

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