PHP - extracting key values from a $_POST

Question

In my $_POST array, I have the following values:

[txtPe_20_Table1] => 2.3
[txtPa_12_Table1] => 0.00
[txtPa_25_Table1] => 0.00
[txtPa_35_Table1] => 0.00
[txtPa_50_Table1] => 0.00
[txtPa_100_Table1] => 0.00
[txtPa_200_Table1] => 0.00
[txtPr_12_Table1] => 0.00

Now, what I want to do is extract only the number values from the keys starting with 'txtPa_'.

What would be the best approach to do this? Should I use regex or just loop through the array searching for a substr beginning with 'txtPa_'?

i would change the form to group txtPa together in to an array. otherwise a foreach loop and look at the key — user557846
– user557846, Commented Jun 7, 2015 at 22:37

score 3 · Accepted Answer · 2015-06-07 22:53:52Z

3

while it would be best to structure the form so you get the keys grouped together. if you can't then you can do this:

foreach($_POST as $key=>$var){
  if(substr($key, 0, 6)=='txtPa_'){
  //so something with $var
  }
}

from @Rizier123

$filtered = array_filter(function($k){ return strpos($k, "txtPa_") === 0; },ARRAY_FILTER_USE_KEY);

form change option

..

<input type="text" name="txtPa[12_Table1]">
<input type="text" name="txtPa[25_Table1]">

etc then you have the array $_POST[txtPa]

edited Jun 7, 2015 at 22:53

answered Jun 7, 2015 at 22:40

user557846

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2 Comments

Rizier123 Over a year ago

Or simple an array_filter() call with the flag for keys :) (PHP >=5.6)

Rizier123 Over a year ago

If you want to add it to your answer: $filtered = array_filter(function($k){ return strpos($k, "txtPa_") === 0; }, ARRAY_FILTER_USE_KEY);

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