How can we calculate where the aaray ends?

Question

Hi I have an array result like this, example 1:

Array ( [0] =>15 [1] => 16 [2] => 17 [3] => 18 )

example 2:

Array ( [0] =>15 [1] => 16 [2] => 17 [3] => 18 [4] => 18 )

The first array ends at array[3] The second array ends at array[4] How to calculate where the array ends Is there any function to calculate this

Answer 1

Use the count function:

count(myArray)

This will tell you how many elements you have in the array.

http://www.w3schools.com/php/func_array_count.asp

Answer 2

If it's just a normal numerically indexed array, then you can just use count(), which gives you the number of elements in the array. Since arrays are zero-based by default, you'll need to subtract one to get the index of the final element:

$array = array(0 => 15, 1 => 16, 2 => 17, 3 => 18);
$index = count($array) - 1;
echo $array[$index];

Answer 3

(Directly copied from http://www.php.net/manual/en/function.count.php)

Depending on what do you mean by "end",

<?php
$yourArray = array(1=>'a', 7=>'b', 5=>'c');

print count($yourArray); // prints 3

end($yourArray);
print key($yourArray); // prints 5

print max(array_keys($yourArray)); // prints 7
?> 

For a normal array, just use count($a) - 1.

Answer 4

I think what you are trying to do is count the number of elements in an array?

If so this would be the count function. http://php.net/manual/en/function.count.php

Answer 5

Associative array / array-with-holes agnostic:

$lastElement = end($array);
$lastKey     = key($array); // only after end(); has set the internal array pointer!

Answer 6

If you only need the last value of the array,you can just use array_pop

$arr = array('a','b','c');
echo array_pop($arr); //get 'c'

For fun:

$a = range(1, 100000);
shuffle($a);
$ts = microtime(true);
echo end($a),"\n";
printf("End =%.6f\n", microtime(true) - $ts);


//$b = range(1, 100000)
//shuffle($b);
reset($a);
$ts = microtime(true);
echo array_pop($a),"\n";
printf("Array_Pop=%.6f\n", microtime(true) - $ts);

Result is:

68875
End=0.000289
68875
Array_Pop=0.000053