Understand PHP arrays

Question

I'm a newbie and I have a very basic question about PHP arrays

Code:

 While(!feof($file_handle))
  { 
     $SecondRow = fgets($file_handle); //gets row
     $trimmed = trim($SecondRow); //removes extra bits
     $replace = array("'"); 
     $finalstring = str_replace($replace, "_", $trimmed); //Still a string w/o "'"'s

     $CleanString = preg_split("/[\s]*[,][\s]*/", $finalstring); //creates the array

     //print_r($CleanString);    
     echo "Row " . $CleanString[1]. "<br/>"; //??????
   .....
 }//end while

the opened file has the following:

0001,sparta 
0005,PURCHASING

... ... ...

Question: When I echo "Row " . $array[0], I get the first column as expected. But when I echo "Row " . $array[1], I get an the "Undefined offset: 1" error. When the string is read into the array (via preg_split) aren't both array[0]->0001 and array[1]->sparta set?

thanks.

instead of echoing why don't you do a print_r() or a var_dump() to let you know exactly what $CleanString contains? These two functions are very useful for debugging purposes. — Crashspeeder
– Crashspeeder, Commented Oct 21, 2011 at 17:31
I tried explode(',', $finalstring) and rec'd the same result. My trying to break the string into an array so i can insert into a mysql database. I'm i bit confused as to why [o] is as intended, but [1] is not — a_Texas
– a_Texas, Commented Oct 21, 2011 at 17:41
Your example works for me. Show me how do you open the file? — mephisto123
– mephisto123, Commented Oct 21, 2011 at 17:52

Jason McCreary · Accepted Answer · 2011-10-21 17:41:05Z

3

Looking at your entire code, you're essentially replicating a native function like fgetcsv() or one of it's equivalents.

Just pick one and be done :)

As far as determining how to use the array, as noted in the comments use print_r or var_dump() to guide you. Also read up on PHP Arrays

edited Oct 21, 2011 at 17:41

answered Oct 21, 2011 at 17:33

Jason McCreary

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4 Comments

a_Texas Over a year ago

Hi,explode(',', $finalstring)

a_Texas Over a year ago

ah.. i'll take a look at this function. any ideas as to why [1] is giving an error?

a_Texas Over a year ago

Thanks for the fgetcsv. Much simpler to use

Jason McCreary Over a year ago

Indeed. If it's what you went with, mark this as the answer by clicking the checkmark. Welcome to StackOverflow.

Sawny · Accepted Answer · 2011-10-21 17:36:54Z

-1

This is because fgets() get one row at time (one row per "loop").

edited Oct 21, 2011 at 17:36

answered Oct 21, 2011 at 17:31

Sawny

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3 Comments

Marc B Over a year ago

What does that have anything to do with how many/few pieces each line splits into?

Sawny Over a year ago

He says "echo "Row " . $array[0]" so I posted why he don't get array[1]. I see now that he really asked about columns, not rows.

a_Texas Over a year ago

correct. Sorry for the confusion. I understand fgets, just a bit confused b.c [1] is giving an error

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