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[MEDICAL] PREVENTION
php prev() function syntax
Function: Point the internal pointer to the previous element in the array and output it.
Syntax: prev(array)
Parameters:
| Parameter | Description |
| array | Required. Specify the array to be operated on. |
Note: If the array contains empty cells, or the value of the cell is 0, this function will also return FALSE when encountering these cells.
php prev() function example
<?php
$people = array("西门", "灭绝", "无忌");
$people2 = next($people); //指向下一个元素 灭绝
echo $people2;
echo "<br>";
$people3 = prev($people);//指向上一个元素 西门
echo $people3;
?>Run instance»
Click the "Run instance" button to view the online instance
Output:
灭绝 西门
<?php
$arr = array("peter", "官人", "欧阳克");
$arr2 = next($arr); //指向下一个元素 官人
echo $arr2;
echo "<br>";
$arr3 = prev($arr);//指向上一个元素 peter
echo $arr3;
?>Run Instance»
Click the "Run Instance" button to view the online instance
Output:
官人 peter