How to remove the content after the specified position in php

Removal method: 1. Use the "substr_replace($str,'', position value)" statement to replace all characters after the specified position in the string with null characters, thereby removing all characters; 2. Use The "array_splice($arr, position value)" statement can remove all elements after the specified position in the array.

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

php realizes two ways of removing the content after specifying the location Method:

• Use substr_replace() function

• Use array_splice() function

1. substr_replace() function

Use substr_replace() to remove all characters after the specified position in the string (just set the replacement value to a null character)

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
$str = &#39;hello,world,hello,world&#39;;
$replace = &#39;&#39;;
echo "去掉第1个字符后的内容".substr_replace($str, $replace, 1)."<br>";
echo "去掉第2个字符后的内容".substr_replace($str, $replace, 2)."<br>";
echo "去掉第3个字符后的内容".substr_replace($str, $replace, 3)."<br>";
echo "去掉第4个字符后的内容".substr_replace($str, $replace, 4)."<br>";
echo "去掉第5个字符后的内容".substr_replace($str, $replace, 5)."<br>";
echo "去掉第6个字符后的内容".substr_replace($str, $replace, 6)."<br>";
?>

2. array_splice() function

Use array_splice() to remove all elements after the specified position in the array

Example: There is this An array:

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
$arr=array(10,12,20,25,24);
echo "原数组：";
var_dump($arr);
?>

Delete the content after the first element of the array

echo "删除数组第1个元素后的内容：" ;
array_splice($arr,1);
var_dump($arr);

Delete the second element of the array Content after

echo "删除数组第2个元素后的内容：" ;
array_splice($arr,2);
var_dump($arr);

Delete the content after the 3rd element of the array

echo "删除数组第3个元素后的内容：" ;
array_splice($arr,3);
var_dump($arr);

Delete the 4th element of the array The following content

echo "删除数组第4个元素后的内容：" ;
array_splice($arr,4);
var_dump($arr);

Recommended learning: "PHP Video Tutorial"

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