This is a small article containing tricks and tips I aquired by reading PHP 6 Text Book.
I was used isset() function to check whether these arguements are set or not. And also I need to check this is empty or not.
Here is another function to check both of this requirement at single line.
empty()
It checks if a variable has an empty value: an empty string, 0, NULL,or FALSE.
Example
if ( !empty($_POST[‘name’]) && !empty($_POST[‘comments’]) && !empty($_POST[‘email’]) ) {
echo “Yes”;
}
Hello All,
Yesterday i was searching for a solution to split large array into small pieces. Suddenly i noticed the that php have a built in function to split array into small pieces. It was very surprise to me ..
Here it is
Function : array array_chunk ( array $input , int $size [, bool $preserve_keys= false ] )
< ?php
$input_array = array('a', 'b', 'c', 'd', 'e');
print_r(array_chunk($input_array, 2));
print_r(array_chunk($input_array, 2, true));
?>
The output will be like this : –
Array
(
[0] => Array
(
[0] => a
[1] => b
)
[1] => Array
(
[0] => c
[1] => d
)
[2] => Array
(
[0] => e
)
)
Array
(
[0] => Array
(
[0] => a
[1] => b
)
[1] => Array
(
[2] => c
[3] => d
)
[2] => Array
(
[4] => e
)
)
Have fun Cheers
Here is the PHP function to calculated duration of “wav” or “GSM” files
First we open file using fopen. After we calculate the size of that file (inbytes) using filesize().
Then we unpack the audio File .
unpack(‘vtype/vchannels/Vsamplerate/Vbytespersec/valignment/vbits’,$rawheader);
This will return following array
Array (
[type] => 1
[channels] => 2
[samplerate] => 44100
[bytespersec] => 176400
[alignment] => 4 [bits] => 16 )
from this array we get bytepersec.
Now it is very easy to find out the duration.. !!
$size_in_bytes/bytespersec.
Code is here.
public static function getDuration($file) {
$fp = fopen($file, ‘r’);
$size_in_bytes = filesize($file);
fseek($fp, 20);
$rawheader = fread($fp, 16);
$header = unpack(‘vtype/vchannels/Vsamplerate/Vbytespersec/valignment/vbits’,
$rawheader);
$sec = ceil($size_in_bytes/$header['bytespersec']);
return $sec;
}
Have fun.
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The below code help you to export data from database to csv file
exporttoxls
To export a complete database, you should invoke all the tables via below code and apply the above code
$dbname = ‘mysql_dbname’;
if (!mysql_connect(‘mysql_host’, ‘mysql_user’, ‘mysql_password’)) {
echo ‘Could not connect to mysql’;
exit;
}
$sql = “SHOW TABLES FROM $dbname”;
$result = mysql_query($sql);
if (!$result) {
echo “DB Error, could not list tables\n”;
echo ‘MySQL Error: ‘ . mysql_error();
exit;
}
while ($row = mysql_fetch_row($result)) {
echo “Table: {$row[0]}\n”;
}
mysql_free_result($result);
?>
Simple Email Program
<?php
$to = ‘nobody@example.com’;
$subject = ‘the subject’;
$message = ‘hello’;
$headers = ‘From: webmaster@example.com’ . “\r\n” .
‘Reply-To: webmaster@example.com’ . “\r\n” .
‘X-Mailer: PHP/’ . phpversion();
mail($to, $subject, $message, $headers);
?>
Email With MIME Content
<?php
// multiple recipients
$to = ‘aidan@example.com’ . ‘, ‘; // note the comma
$to .= ‘wez@example.com’;
// subject
$subject = ‘Birthday Reminders for August’;
// message
$message = ‘
<html>
<head>
<title>Birthday Reminders for August</title>
</head>
<body>
<p>Here are the birthdays upcoming in August!</p>
<table>
<tr>
<th>Person</th><th>Day</th><th>Month</th><th>Year</th>
</tr>
<tr>
<td>Joe</td><td>3rd</td><td>August</td><td>1970</td>
</tr>
<tr>
<td>Sally</td><td>17th</td><td>August</td><td>1973</td>
</tr>
</table>
</body>
</html>
‘;
// To send HTML mail, the Content-type header must be set
$headers = ‘MIME-Version: 1.0′ . “\r\n”;
$headers .= ‘Content-type: text/html; charset=iso-8859-1′ . “\r\n”;
// Additional headers
$headers .= ‘To: Mary <mary@example.com>, Kelly <kelly@example.com>’ . “\r\n”;
$headers .= ‘From: Birthday Reminder <birthday@example.com>’ . “\r\n”;
$headers .= ‘Cc: birthdayarchive@example.com’ . “\r\n”;
$headers .= ‘Bcc: birthdaycheck@example.com’ . “\r\n”;
// Mail it
mail($to, $subject, $message, $headers);
?>
This is a nice and simple substitute to get_file_contents() using curl, it returns FALSE if $contents is empty.
<?php
function curl_get_file_contents($URL)
{
$c = curl_init();
curl_setopt($c, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($c, CURLOPT_URL, $URL);
$contents = curl_exec($c);
curl_close($c);
if ($contents) return $contents;
else return FALSE;
}
?>
Then another question
How to enable cURL in your server ?
To enable curl library we need to modify the php.ini file.
1) Locate the following files:
apache\bin\php.ini
php\php.ini
php\php4\php.ini or php\php5\php.ini
2) Uncomment the following line on your php.ini file by removing the semicolon.
;extension=php_curl.dll
3) Restart your apache server.
4) Check your phpinfo if curl was properly enabled.
Otherwise you can dynamically enable the library by calling dl(); function. But it is deprecated by new version of PHP
Categories: PHP, Programming Tags: contents, curl, dl(), dll, file, get, library, php, php.ini, php_curl.dll, url
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