Recursive chmod only on directories

Run find on -type d (directories) with the -exec primary to perform the chmod only on folders:

find /your/path/here -type d -exec chmod o+x {} \;

To be sure it only performs it on desired objects, you can run just find /your/path/here -type d first; it will simply print out the directories it finds.

IE & CDN jQuery source fallback

<!--[if !IE]><!--><script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.0.0/jquery.min.js"></script><script>window.jQuery || document.write('<script src="/js/jquery-3.0.0.min.js"><\/script>')</script><!--<![endif]-->
<!--[if IE]><script src="//cdnjs.cloudflare.com/ajax/libs/jquery/2.2.4/jquery.min.js"></script><script>window.jQuery || document.write('<script src="/js/jquery-2.2.4.min.js"><\/script>')</script><![endif]-->

Sending dynamic status headers from PHP

Sending the right HTTP protocol for headers from PHP is easy, you just need to find which HTTP protocol your server is using. Most servers will be using HTTP/1.1, but allowing PHP to serve the protocol version for you means safer headers for older systems and greater cross-platform compatibility.

Rather than sending

header( 'HTTP/1.1 404 Not Found' );

we're going to send

header( $_SERVER['SERVER_PROTOCOL'] . ' 404 Not Found' );

where

$_SERVER['SERVER_PROTOCOL']

gives us the HTTP protocol which matches the previous 'HTTP/x.x' format.

This can be used with any header that requires the HTTP protocol to be sent, it is not limited to 404 errors in particular.

EDIT 2015-10-10:

Available from PHP 5.4.0, function 'http_response_code' is the alternative to this and sends the correct protocol along with the correct status code description.

Usage: http_response_code(404);
Output: HTTP/1.1 404 Not Found

Recursively zip files with PHP

This function is useful for zipping files/directories when you only have FTP access to a site, and for when you are using a web host ‘File Manager’ which bugs out on permissions or otherwise.

function Zip($source, $destination)
{
    if (!extension_loaded('zip') || !file_exists($source)) {
        return false;
    }
    $zip = new ZipArchive();
    if (!$zip->open($destination, ZIPARCHIVE::CREATE)) {
        return false;
    }
    $source = str_replace('\', '/', realpath($source));
    if (is_dir($source) === true)
    {
        $files = new RecursiveIteratorIterator(new RecursiveDirectoryIterator($source), RecursiveIteratorIterator::SELF_FIRST);
        foreach ($files as $file)
        {
            $file = str_replace('\', '/', $file);
            // Ignore "." and ".." folders
            if( in_array(substr($file, strrpos($file, '/')+1), array('.', '..')) )
                continue;
            $file = realpath($file);
            if (is_dir($file) === true)
            {
                $zip->addEmptyDir(str_replace($source . '/', '', $file . '/'));
            }
            else if (is_file($file) === true)
            {
                $zip->addFromString(str_replace($source . '/', '', $file), file_get_contents($file));
            }
        }
    }
    else if (is_file($source) === true)
    {
        $zip->addFromString(basename($source), file_get_contents($source));
    }
    return $zip->close();
}

Zip('/folder/to/compress/', './compressed.zip');

Recursively copy files with PHP

This function is useful for copying files when you only have FTP access to a site, and for when you are using a web host 'File Manager' which bugs out on permissions or otherwise.

function recurse_copy($src, $dst) { 
    $dir = opendir($src); 
    @mkdir($dst); 
    while(false !== ( $file = readdir($dir)) ) { 
        if (( $file != '.' ) && ( $file != '..' )) { 
            if ( is_dir($src . '/' . $file) ) { 
                recurse_copy($src . '/' . $file,$dst . '/' . $file); 
            } 
            else { 
                copy($src . '/' . $file,$dst . '/' . $file); 
            } 
        } 
    } 
    closedir($dir); 
} 

recurse_copy('./big-directory', './big-directory-new');

Download file with cURL & PHP

CURLOPT_RETURNTRANSFER is a simple way of copying a file from a remote server onto your own. However, if you're downloading a large file you may hit memory limits because the entire contents of the download have to be read to memory before being saved.

Note: Even if your memory limit is set extremely high, you would be putting unnecessary strain on your server by reading in a large file straight to memory.

Instead you can write the download straight to a file stream using CURLOPT_FILE.

$url  = 'http://www.example.com/a-large-file.zip';
$path = '/path/to/a-large-file.zip';
$fp = fopen($path, 'w');
$ch = curl_init($url);
curl_setopt($ch, CURLOPT_FILE, $fp);
$data = curl_exec($ch);
curl_close($ch);
fclose($fp);

Batch Delete from Table in MSSQL

This script allows you to perform an operation in batches. This should allow you to keep the log file for the database down whilst performing large operations.

SET ROWCOUNT allows you to set how many records will be effected per query.
SET @intFlag = 1 sets the loop to start at 1
WHILE (@intFlag <=100) loop through this code X times (for this example 100)
SET @intFlag = @intFlag + 1 add 1 to the loop count

SET ROWCOUNT 500000;

DECLARE @intFlag INT
SET @intFlag = 1
WHILE (@intFlag <=100)
BEGIN

DELETE FROM tblTemp WHERE tmpDate < '2012-10-01'

SET @intFlag = @intFlag + 1
END
GO

Here the ROWCOUNT is set to 500,000. On this server attempting to delete 1,000,000 records by running 2 batches of 500,000 delete records was 35 seconds faster than running a single 1,000,000 delete records statement. But running 10 batches of 100,000 delete records was also slower than 2 batches at 500,000 records. This may vary server to server.

JavaScript str_pad function

JavaScript equivalent of str_pad function for PHP

function strPad(input, length, string) {
    string = string || '0'; input = input + '';
    return input.length >= length ? input : new Array(length - input.length + 1).join(string) + input;
}

Usage: strPad ('1', 3, 0);
Output: 001