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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('content-type:text/html;charset=utf-8'); $str = 'hello,world,hello,world'; $replace = ''; echo "去掉第1个字符后的内容".substr_replace($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('content-type:text/html;charset=utf-8'); $arr=array(10,12,20,25,24); echo "原数组:"; var_dump($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);
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