PHP dynamic variables

Question

I have 30 variables to show, but write the code 30 times is not smart. how can I improve this code? Thank you!!

<?php if ($dimension_01_label) { ?> 
  <tr>
     <td><?= $dimension_01_label ?></td>
     <td><?= $dimension_01 ?></td>
  </tr>
<?php }; ?>
<?php if ($dimension_02_label) { ?> 
  <tr>
    <td><?= $dimension_02_label ?></td>
    <td><?= $dimension_02 ?></td>
  </tr>
<?php }; ?>
<?php if ($dimension_03_label) { ?> 
  <tr>
    <td><?= $dimension_03_label ?></td>
    <td><?= $dimension_03 ?></td>
  </tr>
<?php }; ?>

Yeah, instead of 30 variables, have one array like $dimension['$label'] = $value or$dimension[0] = array($label, $value) — Anthony
– Anthony, Commented May 13, 2015 at 5:12

Community · Accepted Answer · 2017-05-23 10:26:53Z

1

You could use two things:

Use arrays and iterate throug it
Use dynamic variables via {} Examples here: Dynamic variable names in PHP

edited May 23, 2017 at 10:26

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answered May 13, 2015 at 5:04

bish

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Comments

Sean · Accepted Answer · 2015-05-13 05:03:21Z

0

It would be easier if you redid your variable structure and used arrays, but using your current format you could do something like-

<?php
 for($i=1;$i<=30;$i++){
     if (${"dimension_".str_pad($i, 2, "0", STR_PAD_LEFT)."_label"}) { ?> 
  <tr>
     <td><?= ${"dimension_".str_pad($i, 2, "0", STR_PAD_LEFT)."_label"} ?></td>
     <td><?= ${"dimension_".str_pad($i, 2, "0", STR_PAD_LEFT)} ?></td>
  </tr>
<?php 
     }
  } 
?>

answered May 13, 2015 at 5:03

Sean

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1 Comment

Jeff Monteiro Over a year ago

YOU ARE MY HERO! Thank you!

Elyor · Accepted Answer · 2015-05-13 05:02:34Z

0

<?php
for($i = 1; $i++; $i<=30){
    ?>
    <tr>
     <td><?php print $dimension_.$i."_label"; ?></td>
     <td><?php print $dimension_.$i; ?></td>
  </tr>
    <?php
}
?>

answered May 13, 2015 at 5:02

Elyor

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3 Comments

Sean Over a year ago

this does not account for OPs 0 in 01, 02, etc.

Elyor Over a year ago

you can use 'str_pad($i, 2, "0", STR_PAD_LEFT)' for that

Jeff Monteiro Over a year ago

first, in this case is necessary change the "for" putting $i++ after $i<30, however, in my case, using wordpress, this looping not print results...

Sougata Bose · Accepted Answer · 2015-05-13 05:13:43Z

0

You can use variable of variable -

for($i = 1; $i <=30; $i++) {
    $var1 = "dimension_".str_pad($i, 2, 0, STR_PAD_LEFT)."_label";
    $var2 = "dimension_".str_pad($i, 2, 0, STR_PAD_LEFT);
    if ($$var1) {
       echo "<td>".$$var1."</td><td>".$$var2."</td>";
    }
}

Chekc Demo

edited May 13, 2015 at 5:13

answered May 13, 2015 at 5:01

Sougata Bose

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1 Comment

Jeff Monteiro Over a year ago

This code works fine, but is better when you puts <tr> before the first <td> and, </tr> after the last </td> to build lines in the table! However, THANK YOU SO MUCH!

Master Yoda · Accepted Answer · 2015-05-13 05:25:20Z

0

use something like this

$dimension[0] = something;
$dimension[1] = something;

and so on ...

and at time of printing them

for($i=0;$i<count($dimension);$i++)
{ ?>
<tr>
 <td><?= $dimension[$i] ?></td>
 <td><?= $dimension[$i] ?></td>
</tr>
<?php
}

?>

answered May 13, 2015 at 5:25

Master Yoda

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