preg_match_all

i need to extract all words that begin with "a" in file linux.words but i started to write code in php but i have problem i receive all words that contain "a" ,how to fix it, i want to use preg_match_all?
<?php
$counter=0;
$content=file("linux.words");
foreach ($content as $line)
{
//$words = explode(' ', $line); // Split a line by the delimiter "spacer"


preg_match_all("/[a-z]/i",$line,$result);

}
print_r($result)."<br>";
?>

 

'~a[a-z]+~i'

PHP:

... and print_r() after the loop, or add the results to an array and print it after it.

(Also, replace + with * if you want the word "a" to count as well.)

 

can you write a code ?

 

Yes, but I won't.

You've got all the pieces, now put them together. At least show me what you've tried.