How to pass intergers as values from an array into an IF statement in PHP?

Solution:

You need the array key from your loop to get the value of the current position in your loop.

$con_size[$x]
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So you conditional will look like this

if ($line['quantity_c_size_'.$con_size[$x].'_chain'] > 0) {
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Solution:

You can use something like the following:

foreach ($con_size as $value){
  if($line['quantity_c_size_'.$value.'_chain'] > 0 ){
    //Code
  }
}
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Solution:

You can also do the following

<?php

$con_size = array (35,355,36,37,375,38,385,39,395,40,405,41,415,42,425,43,435,44,445,45,455,46,465,47,475,48,485);

foreach ($con_size as $value) {

// check if size is available 
if($line['quantity_c_size_'.$value.'_chain'] > 0 ) { 
    ?>

    <?=$line['product_id']?>, 
    <?=$line['code_c_size_'.$value.'']?>,

    <?=$line['title']?>, 

    <?=preg_replace('/[^\da-z]/i', ' ', $line['amazon_desc']) ?>,
    <?=$size?>,
    <?=$line['colour']?>,
    <?=$line['material']?>,
    <?=$line['upper']?>,
    <?=$line['lining']?>,
    <?=$line['sole']?>,
    <?=$line['heel']?>,
    <?=$line['material2']?>,

    Shoes, 
    UPDATE, 
    <?=$line['shoe_id']?>, 
    http://www.getashoe.co.uk/full/<?=$line['product_id']?>_1.jpg, http://www.getashoe.co.uk/full/<?=$line['product_id']?>_2.jpg,
    http://www.getashoe.co.uk/full/<?=$line['product_id']?>_3.jpg, http://www.getashoe.co.uk/full/<?=$line['product_id']?>_4.jpg,
    <?=$line['price']?>,
    <?=$line['price']?>,
    GBP,
    <?=$line['quantity_c_size_'.$value.'_chain']?>,
    A_GEN_NOTAX,
    <?=$line['added_y']?>-<?=$line['added_m']?>-<?=$line['added_d']?>,
    <?=$line['added_y']?>-<?=$line['added_m']?>-<?=$line['added_d']?>,
    ,
    ,
    ,
    ,
    1,
    ,
    ,
    ,
    ,
    2,
    1

    <br /><br />
    <?
    // finish checking if size is available
    } }

    ?>
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Solution:

You can use foreach() instead of for() like,

foreach($con_size as $val){
  echo $val;
}
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$val returns the array values.