end

(PHP 4, PHP 5, PHP 7)

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。

参数

array: 这个数组。该数组是通过引用传递的，因为它会被这个函数修改。这意味着你必须传入一个真正的变量，而不是函数返回的数组，因为只有真正的变量才能以引用传递。

返回值

返回最后一个元素的值，或者如果是空数组则返回 FALSE 。

范例

Example #1 end() 例子

  <?php

$fruits  = array( 'apple' ,  'banana' ,  'cranberry' );
echo  end ( $fruits );  // cranberry

 ?>

参见

current() - 返回数组中的当前单元
each() - 返回数组中当前的键／值对并将数组指针向前移动一步
prev() - 将数组的内部指针倒回一位
reset() - 将数组的内部指针指向第一个单元
next() - 将数组中的内部指针向前移动一位

用户评论:

[#1] ivijan dot stefan at gmail dot com [2014-05-08 16:47:18]

I found that the function end() is the best for finding extensions on file name. This function cleans backslashes and takes the extension of a file.

<?php private function extension($str){ $str=implode("",explode("\\",$str)); $str=explode(".",$str); $str=strtolower(end($str)); return $str; } // EXAMPLE: $file='name-Of_soMe.File.txt'; echo extension($file); // txt ?>

Very simple.

[#2] Jason [2013-03-18 10:37:15]

$filename = 'somefile.jpg';

php v5.4 does not support the following statement.
echo end(explode(".", $filename)); // return jpg string

instead you have to split into 2 statements
$file = explode(".", $filename);
echo end ($file);

[#3] jorge at REMOVETHIS-2upmedia dot com [2012-03-01 01:20:46]

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.

[#4] franz at develophp dot org [2010-12-01 15:06:00]

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".

[#5] laurence at crazypillstudios dot com [2010-06-07 02:12:19]

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.

[#6] Sam Yong - hellclanner at live dot com [2009-08-23 17:05:29]

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.

[#7] jasper at jtey dot com [2006-07-11 12:48:15]

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" ?>

[#8] ken at expitrans dot com [2005-10-27 09:02:24]

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"; ?>

[#9] [2002-08-28 18:34:37]

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)]; } ?>

[#10] [2002-08-28 18:17:30]

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); } ?>