PHP Code Snippets

//casting
$array = array('id' => 1, 'name' => 'PHP Example');
$article = (object) $array;

//create blank object and add array values to its fields
$array = ['id' => 2, 'name' => 'Kotlin Example'];
$article2 = new stdClass();
foreach ($array as $key => $value)
{
    $article2->$key = $value;
}

//use json_decode
$array = ['id' => 3, 'name' => 'Flutter Example'];
$article3 = json_decode(json_encode($array), FALSE);

$languages = ["Go", "Dart", "Kotlin", "Swift"];
 
$deletedlanguages  = array_pop($languages);

$japaneseNames = [
        '6' => 'Oda',
        '54' => 'Mitsuru',
        '17' => 'Kenichi',
        '1' => 'Saitama'
    ];
$japaneseNames = array_values($japaneseNames);

$movies = ["The Godfather", "A Few Good Men", "Jurassic Park"];
array_unshift($movies , 'Titanic');

$invoice = new stdClass();
$invoice->id = 5;
$invoice->number = "INV-2022050005";

$last_day = date("t", strtotime("February"));
echo $last_day; //28

if ( strtotime('2022-05-20') > strtotime(date('Y-m-d', mktime(0, 0, 0, 5, 21, 2022))) )
   // do something
}

if (new DateTime('2022-05-25') < new DateTime()){
	echo 'Expiration date';
}

$datetime = '2019-01-01 12:00:00';
$timestamp = strtotime($datetime);
echo $timestamp; //1546344000

//current timestamp
print strtotime(date('Y-m-d H:i:s'));

print date("d");
print date("m");
print date("Y");
print date("m-d-Y");
print date("Y-m-d H:i:s");

//use timezone name with PHP date
date_default_timezone_set('America/Anchorage');
$datetime = new DateTime('2022-05-22T05:30:00', new DateTimeZone('America/Cordoba'))

$time_start = microtime(true);

for ($i = 0; $i < 100000; $i++) {
    preg_match('/abc/', 'abcdefabc');
}


$time_end = microtime(true);
$time = $time_end - $time_start;
echo "preg_match(): $time <br/><br/><br/>";


$time_start = microtime(true);
for ($i = 0; $i < 100000; $i++) {
    strpos('abcdefabc', 'abc');
}

$time_end = microtime(true);
$time = $time_end - $time_start;
echo "strpos(): $time\n";

$start = microtime(true);
// Enter your code here, enjoy!
$array = array("1" => "Debugging...",
    "emoji" => "😄 😁 😆", 
    "number" => rand(100,999),
    "version" => phpversion()
);

foreach( $array as $key => $value ){
    echo $key."\t=>\t".$value."\n";
}
$end = microtime(true);

echo sprintf("Elapsed:  %f", $end - $start).PHP_EOL;

echo sprintf("Used RAM:  %s bytes", memory_get_usage());

header('Content-type: application/pdf');  
header('Content-Disposition: inline; filename="myPDF.pdf"'); 
header('Content-Transfer-Encoding: binary'); 
header('Accept-Ranges: bytes'); 
@readfile('myPDF.pdf'); 

//redirect user to any page
header('Location: https://example.com/form-handling/');
header('Location: ' . $_SERVER['HTTP_REFERER']);
header("Location: ".$_SERVER['REQUEST_URI']);

//Add the following line to php.ini file
extension=curl

echo str_pad('27', 4, "0", STR_PAD_LEFT); //0027
echo str_pad('12', 3, "0", STR_PAD_LEFT); //012
echo str_pad('5', 2, "0", STR_PAD_LEFT); //05

$html = 'Welcome, <b>Peter</b><br />Profile';
$output = strip_tags($html, '<br>'); // 'Welcome, Peter<br />Profile'

$text = 'Parenthesis can be used to add friendly comments or asides. They can also be used to (emphasize information) or to set off additional information that might otherwise be disruptive.';
preg_match('#\((.*?)\)#', $text, $matches);
print $matches[1];

$text = 'These [brackets] are used to indicate something is optional.';
preg_match('#\[(.*?)\]#', $text, $matches);
foreach ($matches as $key => $match) {
    print $match.'<br/>';
}

function someFunction() {
  var xmlhttp = new XMLHttpRequest();
    xmlhttp.onreadystatechange = function() {
      if (this.readyState == 4 && this.status == 200) {
        document.querySelectorAll(".result")[0].innerText = this.responseText;
      }
    };
    xmlhttp.open("GET", "some_file.php", true);
    xmlhttp.send();
}
setInterval("someFunction", 10000);

define("GREETING", "Hello world!");
echo GREETING; //"Hello world!"

define("WEB_ROOT", "https://tleapps.com/");
echo "The URL is ".WEB_ROOT;

//user global keyword
$x = 5;

function myTest() {
    global $x;
    echo "<p>Variable x inside function is: $x</p>";
} 

//use $GLOBALS
$x = 5;
$y = 10;

function sum() {
    $GLOBALS['y'] = $GLOBALS['x'] + $GLOBALS['y'];
} 

sum();

echo $y; // Outputs 15
myTest(); 

//command line
php -v

//PHP methods and constant
phpinfo();
echo 'My PHP version is: '.phpversion();
echo PHP_VERSION;