Basic PHP Array

Question

I have the following Array:

$a = array();
$handle = fopen('test.csv','r');
while (!feof($handle)){
    $a = fgetcsv($handle,",");
}
fclose($handle);
echo $a[100];

Accompanied with the following CSV file (test.csv):

100,1245
500,111
600,12

I am getting the following error:

Notice: Undefined offset: 100

I don't understand what I am doing wrong. I have two columns, I want the first column to be the key, and the second column the value. I would then expect to have $a[100] return 1245. What am I missing? Why is this so hard?

EDIT

I want the first column to be the key and the second column to be the value. HOW do I achieve that goal? THAT is the question. Please don't get side tracked...

$a[100] does not exist. the array contains 3 items only, so only $a[0], $a[1], and $a[2], are valid. if you're creating a key/value array (whatever that's called in PHP), then use $a["100"] instead. — Fede
– Fede, Commented Dec 18, 2014 at 4:23
To debug the array use var_dump or print_r for your reference. — jogesh_pi
– jogesh_pi, Commented Dec 18, 2014 at 4:24
100 is not the key, it's a value. Keys will be automatically assigned from 0. — EternalHour
– EternalHour, Commented Dec 18, 2014 at 4:24
@HighCore why does it only contain 3 items? Why does it not contain 3 keys and 3 values? — LanterneRouge
– LanterneRouge, Commented Dec 18, 2014 at 4:24

Ronser · Accepted Answer · 2014-12-18 04:28:01Z

3

You can try

$final  =   array();
foreach($a as $val){
    $var    =   explode(',',$val);
    $final[$var[0]] =   $var[1];
}

echo $final[100];

Output: 1245

answered Dec 18, 2014 at 4:28

Ronser

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6 Comments

LanterneRouge Over a year ago

where does this fall in context of the code that I have already shown above? @Ronser

LanterneRouge Over a year ago

this line $final[$var[0]] = $var[1]; throws this error Notice: Undefined offset: 1

LanterneRouge Over a year ago

This is not a solution as I get an undefined offset error.

Ronser Over a year ago

just use print_r($a); exit; below fclose($handle); and post the result

LanterneRouge Over a year ago

Array ( [0] => 600 [1] => 12 )

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