Question: How to save image in directory from URL?
In Below code, Just update the
$savePath and$
downloadImagePath.Script is Ready.
try {
$downloadImagePath='http://www.aboutcity.net/images/aboutcity.png';
$savePath = $_SERVER['DOCUMENT_ROOT'];
$ch = curl_init($downloadImagePath);
$fp = fopen($savePath . '/aboutcity.png', 'wb');
curl_setopt($ch, CURLOPT_FILE, $fp);
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_exec($ch);
curl_close($ch);
fclose($fp);
echo "Image Downloaded Successfully in ".$savePath.' Folder.';
} catch (Exception $e) {
echo $e->getMessage();
}
Question: How to remove empty elements from array?
Below script will remove all the elements which have
null values and
empty data including space.
$array = array(
'key1'=>'value1',
'key2'=>'value2',
'key3'=>'value3',
'key4'=>' ',
'key5'=>' ',
'key6'=>null,
);
$filterArray = array_map('trim',$array);
$filterArray = array_filter($filterArray);
print_r($filterArray);//Array ( [key1] => value1 [key2] => value2 [key3] => value3 )
Question: How to convert object data to array?
It will convert an object to array.
$obj = new stdClass();
$obj->key1 ='Value1';
$obj->key2 ='Value3';
$obj->key3 ='Value3';
$obj->key4 ='Value4';
$array = (Array)$obj;
print_r($array);//Array ( [key1] => Value1 [key2] => Value3 [key3] => Value3 [key4] => Value4 )
Question: Is it possible a function with name?
Yes, that known as
Anonymous functions.
Anonymous functions, also known as
closures, allow the creation of functions which have
no specified name.
$greet = function($name)
{
printf("Hello %s", $name);
};
$greet('Hello');
$greet('Web Technology experts Notes');
Question: What is PHP_EOL in PHP?
End
Of
Line
PHP_EOL is used, when you want a add new line in cross-platform. It will work DOS/Mac/Unix issues.
Question: What are reserved constants in PHP?
http://php.net/manual/en/reserved.constants.php
Question: How to store array in Constants?
You can not store array in php constants.
Because php constant can store single string only.
BUT if you serialize an
array to string then you can store it constants in constnats.
See Examples:
define ("MY_FRUITS", serialize (array ("apple", "cherry", "banana","mango")));
Question: Where to do PHP Practise online?
https://codeanywhere.net/
http://ideone.com/
http://writecodeonline.com/php/
http://codepad.org/
http://sandbox.onlinephpfunctions.com/
http://codepad.viper-7.com/
https://eval.in/
Question: How to start session, if already not started?
If session is started, session_id() will return the string else empty string.
if(session_id() == '') {
session_start();
}
Question: Create a folder if it doesn't already exist?
file_exists is used to check directory exist OR NOT.
mkdir is used to create the new directory.
$path="/path/to/dir";
if (!file_exists($path)) {
mkdir($path, 0755, true);
}
Question: How to convert date to timestamp in PHP?
strtotime function is used to convert the full date time into timestamp.
$timestamp = strtotime('22-09-2008');
Question: What is Difference between isset and array_key_exists?
isset: It is used to check, variable is defined OR NOT.
array_key_exists: it is used to check, an key is available in array or not.
bool array_key_exists ( mixed $key , array $array );
Question: How to return JSON from a PHP Script?
$array = array(
'key1'=>'value1',
'key2'=>'value2',
'key3'=>'value3',
'key4'=>' ',
'key5'=>' ',
'key6'=>null,
);
header('Content-Type: application/json');
echo json_encode($array);
Question: How to change the maximum upload file size to 60MB?
open php.ini file
//This is max file size
upload_max_filesize = 60M
//this is form size including file size, that's why its greater 1 MB
post_max_size = 61M
Question: When to use self over $this?
Use
$this to refer to the current object.
Use
self to refer to the current class.
Example of use of $this
class MyClass1 {
private $nonStaticMember = 'nonStaticMember member Called.';
public function funcName() {
return $this->nonStaticMember;
}
}
$classObj = new MyClass1();
echo $classObj->funcName();//nonStaticMember member Called.
Example of use of self
class MyClass2 {
private static $staticMember = 'staticMember member Called.';
public function funcName() {
return $this::$staticMember;
}
}
$classObj = new MyClass2();
echo $classObj->funcName(); //staticMember member Called.
