Parse User-Agents from a text file and extract Browser/Platform data

parse.php

<?php

# Enable errors
error_reporting( E_ALL );
ini_set( 'display_errors', 1 );

# Push up memory
ini_set( 'memory_limit', '128M' );
ini_set( 'max_execution_time', 300 );

# Init
$lines = 0;
$data = array(
    'platform' => array(),
    'browser' => array()
);
$idents = array_keys( $data );

# Read log
$file = fopen( 'log.txt', 'r' );

# Loop lines
while( ! feof( $file ) ) {

    $lines ++;
    $capabilities = get_browser( fgets( $file ) );
    $browser = $capabilities->parent;
    $platform = $capabilities->platform;

    foreach( $idents as $ident ) {
        if ( isset( $data[$ident][${$ident}] ) ) {
            $data[$ident][${$ident}] ++;
        } else {
            $data[$ident][${$ident}] = 1;
        }
    }

}

# Close file
fclose( $file );

# Sort arrays
foreach( $idents as $ident ) {
    arsort($data[$ident], SORT_NUMERIC);

    echo sprintf(
        '<h1>%s</h1>',
        ucfirst($ident)
    );

    foreach( $data[$ident] as $key => $value ) {
        echo sprintf(
            '%s &#8594; %s (%s%%)<br />',
            $key,
            $value,
            round( ($value * 100 / $lines), 2)
        );
    }
}