Get current git HEAD using PHP

get_current_git_commit.php

<?php
/**
 * Get the hash of the current git HEAD
 * @param str $branch The git branch to check
 * @return mixed Either the hash or a boolean false
 */
function get_current_git_commit( $branch='master' ) {
  if ( $hash = file_get_contents( sprintf( '.git/refs/heads/%s', $branch ) ) ) {
    return $hash;
  } else {
    return false;
  }
}

?>

Suggestion on line 9 :
return trim($hash);

Reference to current git HEAD is stored in .git/HEAD and first parameter for sprintf on line 8 should be taken from there:

Example contents:

$ cat .git/HEAD
ref: refs/heads/master

$ cat .git/refs/heads/master
90b301e9e1ff103ae508a3d26c63cdcf1b32cef2

So it should be something like

preg_match('#^ref:(.+)$#', file_get_contents('.git/HEAD'), $matches);
$currentHead = trim($matches[1]);
if ($hash = file_get_contents( sprintf($currentHead))) {
    // ...
}

or

$currentHead = trim(substr(file_get_contents('.git/HEAD'), 4));

There seems to be a discrepancy in using this on a local git environment or a remote one (like in my case, using gitlab), where one is pointing to the current HEAD in ./git/HEAD, but in some other cases, it just gives you the SHA in .git/HEAD.

Since for me - the release number is only relevant on production, I've used the original instead of @dorantor's example.

Thanks, I developer function for get current , git branch name

function get_current_git_branch(){
    $fname = sprintf( '.git/HEAD' );
    $data = file_get_contents($fname);   
    $ar  = explode( "/", $data );
    $ar = array_reverse($ar);
    return  trim ("" . @$ar[0]) ;
}

function get_current_git_datetime( $branch='master' ) {
      $fname = sprintf( '.git/refs/heads/%s', $branch );
      $time = filemtime($fname);
      if($time != 0 ){
          return date("Y-m-d H:i:s", $time);
        }else{
            return  "time=0";
      }
}

An example adapted for use in a Laravel project:

/**
 * Attempt to Retrieve Current Git Commit Hash in PHP.
 *
 * @return mixed
*/
protected function getCurrentGitCommitHash()
{
    $path = base_path('.git/');

    if (! file_exists($path)) {
        return null;
    }

    $head = trim(substr(file_get_contents($path . 'HEAD'), 4));

    $hash = trim(file_get_contents(sprintf($path . $head)));

    return $hash;
}