数组 函数
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end

(PHP 4, PHP 5)

end — 将数组的内部指针指向最后一个单元

说明

mixed end ( array &$array )

end() 将 array 的内部指针移动到最后一个单元并返回其值。

Example #1 简单的 end() 例子

<?php
$fruits = array('apple','banana','cranberry');
echo end($fruits); // cranberry
?>

参见 current()，each()，prev()，next() 和 reset()。

数组 函数
在线手册：中文 英文
PHP手册
PHP手册 - N: 将数组的内部指针指向最后一个单元

用户评论:

jorge at REMOVETHIS-2upmedia dot com (01-Mar-2012 09:20)

If all you want is the last item of the array without affecting the internal array pointer just do the following:

<?php

function endc( $array ) { return end( $array ); }

$items = array( 'one', 'two', 'three' );
$lastItem = endc( $items ); // three
$current = current( $items ); // one
?>

This works because the parameter to the function is being sent as a copy, not as a reference to the original variable.

Tim C (16-Dec-2010 03:41)

An easy (and correct) way to get the last key:
$lastkey = array_pop(array_keys($arr));

franz at develophp dot org (01-Dec-2010 11:06)

It's interesting to note that when creating an array with numeric keys in no particular order, end() will still only return the value that was the last one to be created. So, if you have something like this:

    <?php
    $a = array();
    $a[1] = 1;
    $a[0] = 0;
    echo end($a);
    ?>

This will print "0".

laurence at crazypillstudios dot com (07-Jun-2010 10:12)

this is a function to move items in an array up or down in the array. it is done by breaking the array into two separate arrays and then have a loop creates the final array adding the item we want to move when the counter is equal to the new position we established the array key, position and direction were passed via a query string

<?php
//parameters
//$array- the array you are modifying
//$keytomove - the key of the item you wish to move
//$pos - the current position of the item: used a count($array) function
//and then loop with incrementing integer to add the position to the up //or down button
//$dir - the direction you want to move it - "up"/"dn"

function change_pos($array, $keytomove, $pos, $dir){
    //count the original number of rows
    $count = count($array);
    //set the integer we will use to place the moved item
    if($dir=="up"){
        if($pos==1){
            //if the item is already first and we try moving it up
            //we send it to the end of the array
            $change = $count;
        }else{
            //anywhere else it just moves back one closer to the start of the array
            $change = $pos-1;
        }
    }
    //do the same for the down button
    if($dir=="dn"){
        if($pos==$count){
            $change = 1;
        }else{
            $change = $pos+1;
        }
    }       
    //copy the element that you wish to move
    $move = $array[$keytomove];   
    //delete the original from the main array
    unset($array[$keytomove]);   
    //create an array of the names of the values we
    //are not moving
    $preint = 1;
    foreach($array as $c){       
        $notmoved["{$preint}"] = $c['name'];       
    $preint++;
    }   
    //loop through all the elements
    $int = 1;
    while($int<=$count){   
        //dynamically change the key of the unmoved item as we increment the counter
        $notmovedkey = $notmoved["$int"];
        //when the counter is equal to the position we want
        //to place the moved entry we pump it into a new array
        if($int==$change){
            $neworder["{$keytomove}"] = $move;
        }
        //add all the other array items if the position number is not met and
        //resume adding them once the moved item is written
        if($contkey!=""){
            $neworder["{$notmovedkey}"] = $array["{$notmovedkey}"];           
        }
    $int++;
    }
   
    return($neworder);
}
?>

This is not too elegant but it works.

Sam Yong - hellclanner at live dot com (24-Aug-2009 01:05)

Take note that end() does not recursively set your multiple dimension arrays' pointer to the end.

Take a look at the following:
<?php

// create the array for testing
$a = array();
$i = 0;
while($i++ < 3){
$a[] = array(dechex(crc32(mt_rand())),dechex(crc32('lol'.mt_rand())));
}

// show the array tree
echo '<pre>';var_dump($a);

// set the pointer of $a to the end
end($a);

// get the current element of $a
var_dump(current($a));
// get the current element of the current element of $a
var_dump(current(current($a)));

?>

You will notice that you probably get something like this:

array(3) {
  [0]=>
  array(2) {
    [0]=>
    string(8) "764d8d20"
    [1]=>
    string(8) "85ee186d"
  }
  [1]=>
  array(2) {
    [0]=>
    string(8) "c8c72466"
    [1]=>
    string(8) "a0fdccb2"
  }
  [2]=>
  array(2) {
    [0]=>
    string(8) "3463a31b"
    [1]=>
    string(8) "589f6b63"
  }
}

array(2) {
  [0]=>
  string(8) "3463a31b"
  [1]=>
  string(8) "589f6b63"
}

string(8) "3463a31b"

The array elements' pointer are still at the first one as current. So do take note.

admin at nabito dot net (06-Aug-2008 08:04)

This is simple way how to get file extension.

<?php
$filename = 'somefile.jpg';
echo end(explode(".", $filename)); // return jpg string

$filename = 'the_another_file.html';
echo end(explode(".", $filename)); // return html string
?>

jasper at jtey dot com (11-Jul-2006 08:48)

This function returns the value at the end of the array, but you may sometimes be interested in the key at the end of the array, particularly when working with non integer indexed arrays:

<?php
// Returns the key at the end of the array
function endKey($array){
 end($array);
 return key($array);
}
?>

Usage example:
<?php
$a = array("one" => "apple", "two" => "orange", "three" => "pear");
echo endKey($a); // will output "three"
?>

ken at expitrans dot com (27-Oct-2005 05:02)

Please note that from version 5.0.4 ==> 5.0.5 that this function now takes an array. This will possibly break some code for instance:

<?php

echo ">> ".end(array_keys(array('x' => 'y')))."\n";

?>

which will return "Fatal error: Only variables can be passed by reference" in version <= 5.0.4 but not in 5.0.5.

If you run into this problem with nested function calls, then an easy workaround is to assign the result from array_keys (or whatever function) to an intermediary variable:

<?php

$x = array_keys(array('x' => 'y'));
echo ">> ".end($x)."\n";

?>

(29-Aug-2002 02:34)

If you need to get a reference on the first or last element of an array, use these functions because reset() and end() only return you a copy that you cannot dereference directly:

<?php
function first(&$array) {
if (!is_array($array)) return &$array;
if (!count($array)) return null;
reset($array);
return &$array[key($array)];
}

function last(&$array) {
if (!is_array($array)) return &$array;
if (!count($array)) return null;
end($array);
return &$array[key($array)];
}
?>

(29-Aug-2002 02:17)

When adding an element to an array, it may be interesting to know with which key it was added. Just adding an element does not change the current position in the array, so calling key() won't return the correct key value; you must first position at end() of the array:

<?php
function array_add(&$array, $value) {
$array[] = $value; // add an element
end($array); // important!
return key($array);
}
?>