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vienhoang/gist:15c5e24bafbe216c4351

Last active August 29, 2015 14:06
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Revisions

  1. vienhoang revised this gist Sep 15, 2014. No changes.
  2. vienhoang created this gist Sep 15, 2014.
    129 changes: 129 additions & 0 deletions gistfile1
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,129 @@
    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; })