How to remove content after specified characters in php

Two methods: 1. Use the "substr_replace($str,"",strpos($str,"specified character") 1)" statement to replace the content after the specified character position with a null character; 2 , use the "substr($str,0,strpos($str,"specified character") 1)" statement.

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

php remove specified characters Two methods for the following content

Method 1: Using strpos() and substr_replace() functions

• Use strpos () Find the position of the specified character. For example, the character d

• ## uses substr_replace() to replace the content after the specified character with the empty character

substr_replace(() ) is used to replace characters starting from the specified position, and we need to start replacing from after the specified character, so the position value of starting replacement is "position 1 of the specified character".

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
$str = "abcdefg";
echo "原字符串：".$str."<br>";
$index = strpos($str,"d");
$res = substr_replace($str,"",$index+1);
echo "去除字符d后的内容：".$res;
?>

Method 2: Use strpos() and substr() functions

• Use strpos function to find Specify the position of the character, for example the character e

• Use the substr function to intercept from the beginning of the string to the position of the specified character

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
$str = "abcdefg";
echo "原字符串：".$str."<br>";
$index = strpos($str,"e");
$res = substr($str,0,$index+1);
echo "去除字符e后的内容：".$res;
?>

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