Pattern Match on a Array Key

Question

Hi. Since I'm finding this site helpful I thought I'd sign up :)

I need to get the stock values out of this array:

Array ( 
[stock0] => 1
[stockdate0] => 
[stock1] => 3 
[stockdate1] => apple 
[stock2] => 2 [
stockdate2] => 
)

I need to pattern match on this array, where the array key = "stock" + 1 wildcard character. I have tried using the array filter function to get every other value on the php manual but the empty values seem to throw it out. I tried alot of different things I found but nothing is working.

Can this be done?

Answer 1

<?php

$foo = 
array ( 
'stock0' => 1,
'stockdate0' => 1,
'stock1' => 3,
'stockdate1' => 2,
);

$keys = array_keys( $foo );
foreach ( $keys as $key ) {
    if ( preg_match( '/stock.$/', $key ) ) {
    var_dump( $key );
    }
}

I'm hoping I interpreted correctly and you wanted 'stock', 1 wildcard character thats not a newline, then end of string.

Answer 2

You should store those as:

Array(
  [0] => Array(
    stock => 1,
    stockdate => ...
  ),
  [1] => Array(
    stock => 3,
    stockdate => apple
  ),
  ...
)

Answer 3

array_filter does not have access to the key and therefore is not the right tool for your job.

I belive what you're looking to do is this:

$stocks = Array ( 
"stock0" => 1,
"stockdate0" => '',
"stock1" => 3, 
"stockdate1" => 'apple',
"stock2" => 2,
"stockdate2" => ''
);


$stockList = array();  //Your list of "stocks" indexed by the number found at the end of "stock"

foreach ($stocks as $stockKey => $stock)
{
  sscanf($stockKey,"stock%d", &stockId);  // scan into a formatted string and return values passed by reference
  if ($stockId !== false)
     $stockList[$stockId] = $stock;
}

Now $stockList looks like this:

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

You may need to fuss with it a bit, but I think this is what you are asking for.

HOWEVER, you really should be following Jeff Ober's advice if you have the option to do so.

Answer 4

Ok working solution: Green for ChronoFish!

 $stockList = array();  //Your list of "stocks" indexed by the number found at the end of "stock"

foreach ($stock as $stockKey => $stock)
{
  sscanf($stockKey,"message%d", $stockId);  // scan into a formatted string and return values passed by reference
  if ($stockId !== false) {
     $stockList[$stockId] = $stock;
}

$stockList=array_values($stockList); //straightens array keys out
$stockList = array_slice ($stockList, "0", $count); //gets rid of blank value generated at end of array (where $count = the array's orginal length)
print_r ($stockList);