Resize image in PHP
Uploaded images from user can be of any size. If you need to use these images, they need to be resized upon upload. Here is a helper class to manage resizing of the images.
Let me know if you find any bugs.
Enable register_global through .htaccess
I would not recommend to enable register_globals, but if you need to enable the register_globals for a particular web folder, you can edit the .htaccess file and append the following to it
php_flag register_globals on
Restart apache and you are on your way.
PHPImpact: 30 useful PHP classes
PHPImpact has posted 30 useful PHP classes here.
Which ones do you use? I have used the following:
Still a lot more interesting ones which I haven’t tried.
PHP single quotes Vs double quotes
Any time you put something in “double” quotes, you are asking PHP interpreter to check that content for a variable. So even though the line do not contain variables within the double quotes, PHP will waste precious computing time scanning them anyway.
$sql = 'select * from employee';
will be much faster than
$sql = "select * from employee";
mysql_insert_id() returns NULL or 0
If you have multiple mysql connections (i.e. mysql_connect() or mysqli_connect()) on the page you will need to specify the the connection you are using when calling this function.
example:
mysql_insert_id($MY_CONN);
Downloading a page in PHP
If you ever need to download a HTTP/FTP or any page, try not to use fopen() and fread() functions. They work but will take enormous amounts of time as compared to curl functions. Try doing as follows:
To GET a page using a url
<?
$url=”http://any.url”;
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1);
$store = curl_exec ($ch);
$xml = curl_exec ($ch);
curl_close ($ch);
?>
To POST to a page using values and fields:
<?
$url=”http://any.url”;
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt ($ch, CURLOPT_POST, 1);
curl_setopt ($ch, CURLOPT_POSTFIELDS, “fieldname=fieldvalue&fieldname=fieldvalue&”);
curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1);
$store = curl_exec ($ch);
$content = curl_exec ($ch); # This returns HTML
curl_close ($ch);
?>
For more information, check the curl function on PHP website.
PHP Data Objects
I was looking for a quick reference/tutorial to implement Data Objects with PHP, very similar to what exists in Java. Found a nice explanation at PHP Data Object
