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How to remove the content after the specified position in php

青灯夜游
青灯夜游Original
2022-04-27 16:01:522116browse

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.

How to remove the content after the specified position in php

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>";
?>

How to remove the content after the specified position in php

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);
?>

How to remove the content after the specified position in php

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);

How to remove the content after the specified position in php

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);

How to remove the content after the specified position in php

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);

How to remove the content after the specified position in php

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);

How to remove the content after the specified position in php

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