How to find the character of a string in php

Methods to obtain characters: 1. Use the substr() function to intercept characters of a certain length from the specified position of the string. The syntax is "substr($str, character position, 1)"; 2. Use mb_substr () function, syntax "mb_substr($str, character position, 1, "character encoding")".

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

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Method 1: Use the substr() function

substr() function can intercept a certain number from the specified position of the string Length of characters:

substr($string, $start , $length)

If you only want to get one character, you can set the $length parameter to 1.

Example:

<?php
$str = "Hello World";
echo substr($str, 0,1).&#39;<br>&#39;;
echo substr($str, 1,1).&#39;<br>&#39;;
echo substr($str, 2,1).&#39;<br>&#39;;
echo substr($str, 3,1).&#39;<br>&#39;;
echo substr($str, 4,1).&#39;<br>&#39;;
echo substr($str, 5,1).&#39;<br>&#39;;
echo substr($str, 6,1).&#39;<br>&#39;;
echo substr($str, 7,1).&#39;<br>&#39;;
echo substr($str, 8,1).&#39;<br>&#39;;
echo substr($str, 9,1).&#39;<br>&#39;;
echo substr($str, -1,1).&#39;<br>&#39;;
?>

Method 2: Use mb_substr() function

mb_substr() The function can intercept a specified part from a string. Unlike the substr() function, the mb_substr() function is not only valid for English characters, but also for Chinese characters. Its syntax format is as follows:

mb_substr($str , $start [, $length = NULL [, $encoding = mb_internal_encoding()]])

• $encoding: Optional parameter, indicating the character encoding of $str. If omitted, the internal character encoding is used.

Example:

<?php
header("Content-type:text/html;charset=utf-8");
$str = "欢迎来到PHP中文网";
echo mb_substr($str,0,1,"utf-8").&#39;<br>&#39;;
echo mb_substr($str,1,1,"utf-8").&#39;<br>&#39;;
echo mb_substr($str, 2,1,"utf-8").&#39;<br>&#39;;
echo mb_substr($str,3,1,"utf-8").&#39;<br>&#39;;
echo mb_substr($str,4,1,"utf-8").&#39;<br>&#39;;
echo mb_substr($str,5,1,"utf-8").&#39;<br>&#39;;
echo mb_substr($str,6,1,"utf-8").&#39;<br>&#39;;
echo mb_substr($str,7,1,"utf-8").&#39;<br>&#39;;
echo mb_substr($str,8,1,"utf-8").&#39;<br>&#39;;
echo mb_substr($str,9,1,"utf-8").&#39;<br>&#39;;
echo mb_substr($str,-1,1,"utf-8").&#39;<br>&#39;;
?>

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