Read first line of file

[a1amattyj]

Hello,

 

I'm trying to read the first line of some large files by PHP, which means, the ideal solution does not work:

 

$content = file($file_import);

 

$fields = explode(",", $content[0]);

 

Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 110 bytes) in C:\wamp\www\exchange\admin\import.php on line 55

 

Is there any other way to read only the first line without opening the whole file?

 

Thanks!!

[wildteen88]

You may want to use fopen/fget instead?

[meltingpoint]

$record_count =1;
$openedfile	=fopen("yourfile.txt", "r");
if(!$openedfile)
{
echo "<center>Error!  Could not open file</center>";
exit;
}
if(flock($openedfile, LOCK_EX))
{
//
$hold[$record_count] = explode(",", trim(fgets($openedfile)));// the "," is what your flat file is delimited by
while(!feof($openedfile))
{
$record_count++;
$hold[$record_count] = explode("|", trim(fgets($openedfile)));
}
flock($openedfile, LOCK_UN);
fclose($openedfile);
}
else
{
echo "<center>File could not be locked - please try again.</center>";
}
print_r( $hold[1]); // is an array containing the contents of the first line of your file.

 

So now you could simply reference the first line of you file as $hold[1].  It is just another way of doing what you had done earlier.  However- that file is 128mb in size.  Most systems limit to 64 mb.  Might want to check and see of it is limited in php.ini file.

[Andy-H]

if ( ($fh = fopen('file.txt', 'r')) !== false)
{
   $firstLine = implode(" ", (fgetcsv($fh, 1000, " ")) );
}
fclose($fh);