How to intercept the first few characters in php

How to intercept the first few characters in php: You can use the substr() function to intercept. The substr() function is used to return the extracted part of the string, returning false if it fails, or returning an empty string. The specific usage is as follows: [substr("Hello world",0,10)].

The substr() function returns the extracted portion of the string, FALSE if it fails, or an empty string.

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Syntax:

substr(string,start,length)

Parameters:

• string Required. Specifies a part of the string to be returned.​

• #start Required. Specifies where in the string to begin.

• length Optional. Specifies the length of the string to be returned. The default is until the end of the string.

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Example:

<?php
echo substr("Hello world",0,10)."<br>";
echo substr("Hello world",1,8)."<br>";
echo substr("Hello world",0,5)."<br>";
echo substr("Hello world",6,6)."<br>";
echo substr("Hello world",0,-1)."<br>";
echo substr("Hello world",-10,-2)."<br>";
echo substr("Hello world",0,-6)."<br>";
echo substr("Hello world",-2-3)."<br>";
?>

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