PHP: Misc

gistfile1

PHP Misc
================================================================================================
Difference between two dates

$date1 = new DateTime('2007-03-24');
$date2 = new DateTime('2009-06-26');
$interval = $date1->diff($date2);
echo 'difference: ' . $interval->y . ' years, ' . $interval->m.' months, '.$interval->d.' days ';
---
Trim ending slashes

$string = 'http://google.com/';

if(substr($string, -1) == '/') {
    $string = substr($string, 0, -1);
}
// 
$string = rtrim($string, '/');

echo $string;

---
Check if string contains substring
if( strpos( $string, $substring ) === false ) { // substring not found in string
	// code
} else { // substring found in string
	// code
}

---
Create zip file
/* creates a compressed zip file */
function create_zip($files = array(),$destination = '',$overwrite = false) {
  //if the zip file already exists and overwrite is false, return false
  if(file_exists($destination) && !$overwrite) { return false; }
  //vars
  $valid_files = array();
  //if files were passed in...
  if(is_array($files)) {
    //cycle through each file
    foreach($files as $file) {
      //make sure the file exists
      if(file_exists($file)) {
        $valid_files[] = $file;
      }
    }
  }
  //if we have good files...
  if(count($valid_files)) {
    //create the archive
    $zip = new ZipArchive();
    if($zip->open($destination,$overwrite ? ZIPARCHIVE::OVERWRITE : ZIPARCHIVE::CREATE) !== true) {
      return false;
    }
    //add the files
    foreach($valid_files as $file) {
      $zip->addFile($file,$file);
    }
    //debug
    //echo 'The zip archive contains ',$zip->numFiles,' files with a status of ',$zip->status;
 
    //close the zip -- done!
    $zip->close();
 
    //check to make sure the file exists
    return file_exists($destination);
  }
  else
  {
    return false;
  }
}

// Usage
$files_to_zip = array(
  'preload-images/1.jpg',
  'preload-images/2.jpg',
  'preload-images/5.jpg',
  'kwicks/ringo.gif',
  'rod.jpg',
  'reddit.gif'
);
//if true, good; if false, zip creation failed
$result = create_zip($files_to_zip,'my-archive.zip');

---
Even or Odd

if ($i % 2) {
	echo "$i is odd";
} else {
	echo "$i is even";
}

---
Remove trailing zeros of a decimal number
function clean_num( $num ){
  $pos = strpos($num, '.');
  if($pos === false) { // it is integer number
    return $num;
  }else{ // it is decimal number
    return rtrim(rtrim($num, '0'), '.');
  }
}

echo clean_num(100.02);
---
array_map, array_walk and array_filter

$origarray1 = array(2.4, 2.6, 3.5);
$origarray2 = array(2.4, 2.6, 3.5);

print_r(array_map('floor', $origarray1)); // $origarray1 stays the same

// changes $origarray2
array_walk($origarray2, function (&$v, $k) { $v = floor($v); }); 
print_r($origarray2);

// this is a more proper use of array_walk
array_walk($origarray1, function ($v, $k) { echo "$k => $v", "\n"; });

// array_map accepts several arrays
print_r(
    array_map(function ($a, $b) { return $a * $b; }, $origarray1, $origarray2)
);

// select only elements that are > 2.5
print_r(
    array_filter($origarray1, function ($a) { return $a > 2.5; })