how to split the array in to two equal parts using php

问题

how to split an array in to two equal parts using array_slice() in PHP ?

This is my requirement:

First array contains: 0-1200

Second array contains: 1200-end

回答1:

From the documentation for array_slice, all you have to do is give array_slice an offset and a length.

In your case:

$firsthalf = array_slice($original, 0, 1200);
$secondhalf = array_slice($original, 1200);

In other words, this code is telling array_slice:

take the first 1200 records;
then, take all the records starting at index 1200;

Since index 1200 is item 1201, this should be what you need.

回答2:

$quantity = count($original_collection);

$collection1 = array_slice($original_collection, 0, intval($quantity / 2), true);
$collection2 = array_diff_key($original_collection, $collection1);

回答3:

$array1 = array_slice($array, 0, 1199);
$array2 = array_slice($array, 1200);

回答4:

I think array_chunk would be easier, especially as you don't need to know how many elements are in the array.

array array_chunk ( array $input , int $size [, bool $preserve_keys = false ] )

<?php
$input_array = array('a', 'b', 'c', 'd', 'e');
$size = ceil(count($input_array)/2));
print_r(array_chunk($input_array, $size));
print_r(array_chunk($input_array, $size, true));
?>

回答5:

$array1 = array_slice($input, 0, 1200);
$array2 = array_slice($input, 1200);

来源：https://stackoverflow.com/questions/5561952/how-to-split-the-array-in-to-two-equal-parts-using-php