PHP reindexing an array? [duplicate]

问题

Forgive my noobness again. I've got an array with 20+ values in it and I take every 20 to shove in my database and then chop them off the front of the array. I want to restart the array's indexes back to 0 but instead it starts at 20 even when I use array_values. I also tried array_merge(array(), $string) What to do?

if($x%20 == 0){
    var_dump($string) // original array
    get_string($string, $body, $binary); //puts the 20 string into my db

    for($y=0; $y <20; $y++) //done with the 20 so I'm removing them
        unset($string[$y]);

    array_values($string); //reindex set $string[20] to $string[0] PLEASE!
    var_dump($string); // this is suppose to be reindexed
}

Instead I get

array // original array
  0 => string '----' (length=25)
  1 => string '----' (length=15)
  2 => string '----' (length=27)
  3 => string '----' (length=22)
  4 => string '----' (length=23)
  5 => string '----' (length=21)
  6 => string '----' (length=26)
  7 => string '----' (length=23)
  8 => string '----' (length=24)
  9 => string '----' (length=31)
  10 => string '----' (length=19)
  11 => string '----' (length=22)
  12 => string '----' (length=24)
  13 => string '----' (length=24)
  14 => string '----' (length=25)
  15 => string '----' (length=12)
  16 => string '----' (length=16)
  17 => string '----' (length=15)
  18 => string '----' (length=23)
  19 => string '----' (length=15)
  20 => string '----' (length=16)
  21 => string '----' (length=27)

array //reindexed array? This was suppose to be [0] and [1]
  20 => string '----' (length=16)
  21 => string '----' (length=27)

回答1:

I usually do:

$array = array_values($array);

Looks like you got most of the way there - just forgot to assign the new array to the old variable.

回答2:

Assign the return value of the reindexed array back to it:

if($x%20 == 0){
    var_dump($string) // original array
    get_string($string, $body, $binary); //puts the 20 string into my db

    for($y=0; $y <20; $y++) //done with the 20 so I'm removing them
        unset($string[$y]);

    $string = array_values($string); //reindex set $string[20] to $string[0] PLEASE!
    var_dump($string); // this is suppose to be reindexed
}

OR, as Brad suggests replace:

for($y=0; $y <20; $y++) //done with the 20 so I'm removing them
            unset($string[$y]);

        $string = array_values($string); //reindex set $string[20] to $string[0] PLEASE!

with:

for($y=0;$y<20; $y++)
    array_shift($string);

回答3:

I would have a look at array_shift. That may do what you're looking for as you're "popping" them off the array.

EDIT

Also, whenever you're dealing with arrays and loops, it's a good idea to keep conscience of the fact that the array may come up short. That is to say, I strongly suggest not coding the fixed for(... <20 ...) but use a variable such as $end = (count($array) < 20 ? count($array) : 20);

来源：https://stackoverflow.com/questions/4393541/php-reindexing-an-array

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indexing

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