PHP Check if array index is set and not out of bound

Question

I am reading from a csv file containing thousands of lines.

Now some lines are not properly formatted and hence when I try to read a particular index in a loop, I get Undefined offset errors.

I want to simply remove those lines. And for that purpose I have to identify which lines are causing problems.

Here is what is happening inside of loop:

$i=0;
while (!feof($file_handle) ) {
$line_of_text = fgetcsv($file_handle, 2048,",");
$idx=$line_of_text[5];
$i++;
//do something else
}

The code works perfectly but I get 10-15 errors Undefined offset: 5 in filepath Now it is really difficult to determine those lines by just looking at the file. So is there a way to check if the row contains index 5 element and if not then show row number? I tried isset but it is not working.

Ahmar

user4035 · Accepted Answer · 2014-02-18 13:07:32Z

4

"I tried isset but it is not working"

isset must work. Try this:

if(isset($line_of_text[5]))
{
    $idx=$line_of_text[5];
}
else
{
    print "incorrect line: $i\n";
}

answered Feb 18, 2014 at 13:07

user4035

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RiggsFolly · Accepted Answer · 2014-02-18 13:14:08Z

2

You could use

if( array_key_exists(5, $line_of_text) ) {
    $idx=$line_of_text[5];
} else {
    print "incorrect line: $i\n";
}

Or

if ( count($line_of_text) >= 6 ) {
    $idx=$line_of_text[5];
} else {
    print "incorrect line: $i\n";
}

But isset($line_of_text[5]); should also work.

answered Feb 18, 2014 at 13:14

RiggsFolly

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