PHP创建数组，其中键和值相同

Question

I am using the range() function to create an array. However, I want the keys to be the same as the value . This is ok when i do range(0, 10) as the index starts from 0 , however if i do range(1, 11) , the index will still start from 0 , so it ends up 0=>1 when i want it to be 1=>1

How can I use range() to create an array where the key is the same as the value ?

Answer 1

array_combine怎么样 ？

$b = array_combine(range(1,10), range(1,10));

Answer 2

Or you did it this way:

$b = array_slice(range(0,10), 1, NULL, TRUE);

Find the output here: http://codepad.org/gx9QH7ES

Answer 3

Create a function to make this:

if (! function_exists('sequence_equal'))
{
    function sequence_equal($low, $hight, $step = 1)
    {
        return array_combine($range = range($low, $hight, $step), $range);
    }
}

Using:

print_r(sequence_equal(1, 10, 2));

Output:

array (
  1 => 1,
  3 => 3,
  5 => 5,
  7 => 7,
  9 => 9,
)

In PHP 5.5 >= you can use Generator to make this:

function sequence_equal($low, $hight, $step = 1)
{
    for ($i = $low; $i < $hight; $i += $step) {

        yield $i => $i;
    }
}

Answer 4

There is no out of the box solution for this. You will have to create the array yourself, like so:

$temp = array();
foreach(range(1, 11) as $n) {
   $temp[$n] = $n;
}

But, more importantly, why do you need this? You can just use the value itself?

Answer 5

<?php
function createArray($start, $end){
  $arr = array();
  foreach(range($start, $end) as $number){
    $arr[$number] = $number;
  }
  return $arr;
}

print_r(createArray(1, 10));
?>

See output here: http://codepad.org/Z4lFSyMy

Answer 6

<?php

$array = array();
foreach (range(1,11) as $r)
  $array[$r] = $r;

print_r($array);

?>