Hướng dẫn end php

(PHP 4, PHP 5, PHP 7, PHP 8)

end — Set the internal pointer of an array to its last element

Description

end(array|object &$array): mixed

Parameters

The array. This array is passed by reference because it is modified by the function. This means you must pass it a real variable and not a function returning an array because only actual variables may be passed by reference.

Return Values

Returns the value of the last element or false for empty array.

Examples

Example #1 end() example

$fruits

See Also

• current() - Return the current element in an array
• each() - Return the current key and value pair from an array and advance the array cursor
• prev() - Rewind the internal array pointer
• reset() - Set the internal pointer of an array to its first element
• next() - Advance the internal pointer of an array
• array_key_last() - Gets the last key of an array

franz at develophp dot org ¶

11 years ago

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:

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

This will print "0".

jasper at jtey dot com ¶

16 years ago

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:

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

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

Anonymous ¶

20 years ago

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:

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

function

jorge at REMOVETHIS-2upmedia dot com ¶

10 years ago

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

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.

ivijan dot stefan at gmail dot com ¶

8 years ago

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.

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.

Jacob ¶

5 years ago

Attempting to get the value of a key from an empty array through end() will result in NULL instead of throwing an error or warning becuse end() on an empty array results in false:

$a

Aleksandr ¶

4 years ago

$A=[1];
print_r($A);
end($A[5]);
print_r($A);
?>

Array
(
    [0] => 1
)
Array
(
    [0] => 1
    [5] =>
)

Jason ¶

9 years ago

$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);

ken at expitrans dot com ¶

16 years ago

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:

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:

$x

laurence at crazypillstudios dot com ¶

12 years ago

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

//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(

Anonymous ¶

20 years ago

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:

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

Sam Yong - hellclanner at live dot com ¶

13 years ago

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

Take a look at the following:
// 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 '

';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.

 Omolewa
stephen ¶
5 years ago

I found using pathinfo very useful in getting extension of  a file. 
  $filename = dictionary.txt;
   $ext = strtolower(pathinfo($filename, PATHINFO_EXTENSION)) ;
echo $ext; // txt
?>

 aaaaa976 at gmail dot com ¶
3 years ago


To get the first element:
    // Get first item.
    foreach ($array as $item) {
        $first = $item;
        break;
    }
    // $first will have the first element.

 goran ¶
6 years ago

In case you need add separator at end
$numbers = array('1','2','3','4');
        foreach ($numbers as $number){
            echo $number;
            if (end($numbers) != $number){
                echo ', ';
            }
        }