How to find the first character of a string in php

4 methods: 1. Use the "$string variable name[0]" statement; 2. Use substr() to intercept the first character, the syntax is "substr(English string,0,1)" ; 3. Use mb_substr() to intercept the first character, the syntax is "mb_substr(Chinese string, 0,1, encoding)"; 4. Use mb_strcut() to intercept the first character, the syntax is "mb_strcut(Chinese string, 0 ,3,encoding)" or "mb_strcut(English string,0,1,encoding)".

The operating environment of this tutorial: windows7 system, PHP version 8.1, DELL G3 computer

php gets the string Several methods for the first character in

Method 1: Use the $string variable name[0] statement to obtain the

Seen as a character collection (array), the first value of the array is the value of the element with index 0.

Note: Chinese strings are not applicable!

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
$str = &#39;hello&#39;;
echo "原字符串为：";
var_dump($str);
echo "字符串的第一个字符为：".$str[0];
?>

Method 2: Use the substr() function to intercept the first character

The substr() function can extract the first character from the string Intercept characters of a certain length at the specified position.

substr(string,start,length)

Just set the second parameter of the function to 0 and the third parameter to 1

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
$str = &#39;Ahello&#39;;
echo "原字符串为：";
var_dump($str);
echo "字符串的第一个字符为：".substr($str,0,1)."<br>";
?>

Note: Chinese strings are not applicable!

Method 3: Use the mb_substr() function to intercept the first character

The mb_substr() function can intercept a specified part of a string, similar to substr() The difference between the functions is that the mb_substr() function is not only valid for English characters, but also for Chinese characters.

mb_substr(string,start,length,encoding)

You only need to set the second parameter of the function to 0 and the third parameter to 1

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
$str = &#39;Mhello&#39;;
echo "原字符串为：";
var_dump($str);
echo "字符串的第一个字符为：".mb_substr($str,0,1,"utf-8")."<br><br><br>";

$str = &#39;欢迎来到PHP中文网&#39;;
echo "原字符串为：";
var_dump($str);
echo "字符串的第一个字符为：".mb_substr($str,0,1,"utf-8")."<br>";
?>

Method 4: Use mb_strcut() to intercept the first character

mb_strcut() and mb_substr() are somewhat similar and can be set Character encoding, but the difference is that mb_substr splits characters by words, while mb_strcut splits characters by bytes but does not produce half a character. That is:

• mb_substr() function represents a unit for either English or Chinese characters.

• mb_strcut() function has 3 units for Chinese characters and 1 unit for English characters.

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
$str = &#39;Bhello&#39;;
echo "原字符串为：";
var_dump($str);
echo "字符串的第一个字符为：".mb_strcut($str,0,1,"utf-8")."<br><br><br>";

$str = &#39;欢迎来到这里&#39;;
echo "原字符串为：";
var_dump($str);
echo "字符串的第一个字符为：".mb_strcut($str,0,3,"utf-8")."<br>";
?>

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