PHP split array based on value [duplicate]

问题

Possible Duplicate:
How to split an array based on a certain value?

Here is an example array I want to split:

(0, 1 ,2 ,3, 0, 4, 5)

How do I split it in 2 array like this?

(0, 1 ,2 ,3) (0, 4, 5)

Basically I want to check if the value of an element is zero and then create an array of all the elements until I find another zero. I can't seem to come up with a solution to this.

回答1:

$array = array(0, 1 ,2 ,3, 0, 4, 5);
$result = array();
$index = -1;
foreach ($array as $number) {
    if ($number == 0) {
        $index++;
    }
    $result[$index][] = $number;
}
echo print_r($result, true);

You'll end with the following.

array(
    0 => array(0, 1, 2, 3),
    1 => array(0, 4, 5)
)

回答2:

$x = -1;
$newArr = array();
$array = array(0,1,2,3,0,4,5,6);

foreach ($array as $key => $value) {
  if($value == 0) 
    $x++;

  $newArr[$x][] = $value;

}

回答3:

You can use PHP explode to break up into String arrays for each appearance of 0, but I see now that you have an array, not a string. As suggested above now, you can use the inverse, PHP implode.

回答4:

<?php
$a=array(0, 1 ,2 ,3, 0, 4, 5);
$b =array();
$k=-1;
foreach($a as $key=>$val)
{
    if($val==0)
    {
      $k++;  
    }

    $b[$k][]=$val;
}


echo"<pre>";



print_r($b[0]);

print_r($b[1]);


foreach($b as $key=>$val)
{
    echo"<pre>";
    echo $val;
    echo"</pre>";
}
?>

回答5:

First concatenate the elements, then split using 0 and then separate them again by prefixing 0 e.g. below

$concatenatedStr = implode(',', $array);
$indx = 0;
$fragments = array();
$fragementStrings= explode("0,", $concatenatedStr);
foreach($fragementStrings as $fragementString) {
  //you get your fragements here 
  $fragments[$indx++][] = explode(",", "0,".$fragementString);
}

回答6:

Similar to a comment, array_keys can be used to search for all keys containing the value you search for (zero in your case).

You then can loop over these positions and slice the array (see array_slice) into the parts.

Example (Demo):

$keys  = array_keys($array, 0);
$parts = [];
$last  = 0;

foreach ($keys as $key)
{
    $last !== $key 
        && $parts[] = array_slice($array, $last, $key - $last, true);    
    $last = $key;
}

$parts[] = isset($key) ? array_slice($array, $key, null, true) : $array;

This variant even preserves original keys, exemplary $parts output:

array(2) {
  [0] => array(4) {
    [0] => int(0)
    [1] => int(1)
    [2] => int(2)
    [3] => int(3)
  }
  [1] => array(3) {
    [4] => int(0)
    [5] => int(4)
    [6] => int(5)
  }
}

Another alternative could be similar to some other answers outlined. The following variant does preserve keys, too:

$array = [0, 1 ,2 ,3, 0, 4, 5];
$parts = [];
$index = 0;

foreach ($array as $key => $number)
{
    $number == 0 and $key and $index++;
    $parts[$index][$key] = $number;
}

Output (Demo):

Array
(
    [0] => Array
        (
            [0] => 0
            [1] => 1
            [2] => 2
            [3] => 3
        )

    [1] => Array
        (
            [4] => 0
            [5] => 4
            [6] => 5
        )

)

来源：https://stackoverflow.com/questions/13852737/php-split-array-based-on-value

标签

php

array-splice