prev

Definition and usage

The prev() function points the internal pointer to the previous element in the array and outputs it.

Related methods:

• next() - Points the inner pointer to the next element in the array and outputs
• current() - Returns the value of the current element in the array
• end() - Point the inner pointer to the last element in the array and output
• reset() - Points the inner pointer to the first element in the array and outputs
• each() - Returns the key name and key value of the current element and moves the internal pointer forward

Example

Example 1

Output the values ​​of the current element, the next element and the previous element in the array:

 <?php
$people = array ( "Bill" , "Steve" , "Mark" , "David" ) ;

echo current ( $people ) . "<br>" ;
echo next ( $people ) . "<br>" ;
echo prev ( $people ) ;
?>

Try it yourself

Example 2

Demonstrate all related methods:

 <?php
$people = array ( "Bill" , "Steve" , "Mark" , "David" ) ;

echo current ( $people ) . "<br>" ; // The current element is Bill
echo next ( $people ) . "<br>" ; // The next element of Bill is Steve
echo current ( $people ) . "<br>" ; // The current element is Steve now
echo prev ( $people ) . "<br>" ; // The previous element of Steve is Bill
echo end ( $people ) . "<br>" ; // The last element is David
echo prev ( $people ) . "<br>" ; // The element before David is Mark
echo current ( $people ) . "<br>" ; // The current current element is Mark
echo reset ( $people ) . "<br>" ; // Move the internal pointer to the first element of the array, i.e. Bill
echo next ( $people ) . "<br>" ; // The next element of Bill is Steve

print_r ( each ( $people ) ) ; // Returns the key name and key value of the current element (currently Steve) and moves the internal pointer forward
?>

Try it yourself