How to get only the first few characters in php

藏色散人
Release: 2023-03-11 07:46:01
Original
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php method to get only the first few characters: first create a PHP sample file; then define a string; finally intercept the first 3 characters through the "substr($str, 0, 3);" method Can.

How to get only the first few characters in php

The operating environment of this article: Windows7 system, PHP7.1 version, Dell G3 computer

How to get only the first few characters of php ?

Read (intercept substr) the first N characters of the string in PHP or take a few characters starting from the first few characters

<?php 
$str = "123456789";
echo substr($str , 0 , 3);//从左边第一位字符起截取3位字符:结果:123
echo substr($str , 3 , 3);//从左边第3位字符起截取3位字符:结果:456
?>
<?php
$rest = substr("abcdef", -1);    // 返回 "f"
$rest = substr("abcdef", -2);    // 返回 "ef"
$rest = substr("abcdef", -3, 1); // 返回 "d"
?>
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<?php
$rest = substr("abcdef", 0, -1);  // 返回 "abcde"
$rest = substr("abcdef", 2, -1);  // 返回 "cde"
$rest = substr("abcdef", 4, -4);  // 返回 ""
$rest = substr("abcdef", -3, -1); // 返回 "de"
?>
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<?php
echo substr(&#39;abcdef&#39;, 1);     // bcdef
echo substr(&#39;abcdef&#39;, 1, 3);  // bcd
echo substr(&#39;abcdef&#39;, 0, 4);  // abcd
echo substr(&#39;abcdef&#39;, 0, 8);  // abcdef
echo substr(&#39;abcdef&#39;, -1, 1); // f
// 访问字符串中的单个字符
// 也可以使用中括号
$string = &#39;abcdef&#39;;
echo $string[0];                 // a
echo $string[3];                 // d
echo $string[strlen($string)-1]; // f
?>
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Intercepting and obtaining the length of Chinese strings mb_substr()

$str = &#39;我abc是谁&#39;;  //utf-8编码的字符串
echo mb_substr($str, 0, 2, &#39;utf-8&#39;); //输出 我a
 
$str = &#39;我是谁&#39;;  //gbk编码的字符串
echo mb_substr($str, 0, 1, &#39;gbk&#39;); //输出 我
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