Catch array combine warning and print own error message?

Question

I read some csv file and map the contents to the field names using array_combine:

$csv = array();
$a = array('some fields');
$b = array_combine($a, $csv);

However if the field names in $a are different from what I specified in my csv file the method will fails with a warning

array_combine() [function.array-combine]: Both parameters should have an equal number of elements

I tried using try and catch but this does not work. As a note, I am working with zend framework.

Any ideas how to catch the warning?

dtbarne · Accepted Answer · 2011-05-17 06:12:09Z

2

Grab the number of columns in the CSV and then compare it to $a's length. Since you didn't specify, I'll assume the array is one dimensional with each line from the CSV file.

if (count($csv) > 0 && count($a) == count(explode(',', $csv[0]))) {
    // Valid
} else {
    // Not valid
}

answered May 17, 2011 at 6:12

dtbarne

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deceze · Accepted Answer · 2011-05-17 06:30:14Z

2

$b = @array_combine($a, $csv);
if (!$b) {
    // error!
}

You should not (ab)use the @ operator, but in this case it does most literally what you want.

answered May 17, 2011 at 6:30

deceze♦

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2 Comments

dtbarne Over a year ago

Simplest solution. Only issue is you won't know why it didn't work.

deceze Over a year ago

True. !$b may be either because the arrays were empty or because they were of different lengths. If you're really interested you can do a if (count($a) != count($csv)) to output the right error message.

jopke · Accepted Answer · 2011-05-17 06:13:32Z

1

According to the docs if either array is empty or if they are of different lengths, array_combine will return false.

So you should be able to do something like:

if($b = array_combine($a, $csv)) {

} else {
   ... the warning occurred ...
}

answered May 17, 2011 at 6:13

jopke

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1 Comment

dtbarne Over a year ago

True, but I think he's trying to prevent the warning from being thrown at all.

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