PHP captures instant stock information

PHP captures instant stock information
<?  
$file_name="";  
if(is_file($file_name)) {  
exec("cat $file_name",$buffer);  
for($i=0;$i<count($buffer);$i++) {  
if(strstr($buffer[$i],"<!--Stock Market Daily Dynamics-->")) break; //Find this line
}  

for($j=$i;$j<$i+70;$j++) { //Catch the following 70 lines
$str.= $buffer[$j];  
}  
echo $str;  
}  
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