<?php
//all constants will be global
//in fact, PHP wont allow you to declare a constant inside a function
const ALL_CONSTANTS_ARE_GLOBAL = "Since a constant cant be changed, it has global visibility";
echo "<p>Accessing a constant at the global level: " . ALL_CONSTANTS_ARE_GLOBAL . "</p>";
//create and output a variable outside a function
$declaredGlobally = "This was declared globally!";
echo "<p>The \$declaredGlobally variable begins with value: <strong>" . $declaredGlobally . "</strong></p>";
//--------------------------------------------------------------------------------
/*
define a function
what happens in the function is isolated
from the code outside the function, and vice-versa
*/
function someFunction()
{
echo "<p>Accessing a constant from inside a function: " . ALL_CONSTANTS_ARE_GLOBAL . "</p>";
echo "<p>Try to access from inside a function a variable declared outside. This creates an error message. " . $declaredGlobally . "</p>";
$declaredInsideAfunction = "We're in las vegas, baby!";
echo "<p>A variable declared inside a function can be accessed inside that function: " . $declaredInsideAfunction . "</p>";
}
someFunction();
echo "<p>A variable declared inside a function CANNOT be accessed outside that function: " . $declaredInsideAfunction . "</p>";
//test the value of the global variable again
echo "<p>The \$declaredGlobally variable ends with value: <strong>" . $declaredGlobally . "</strong></p>";
//--------------------------------------------------------------------------------
?>
</span>
</body>
</html>
$sql = "SELECT * FROM trial WHERE id =17";
$result = mysql_query($sql);
while($row = mysql_fetch_assoc($result))
{
echo $row['image']."<BR>";
} */
$memory2 = memory_get_peak_usage(true);
function someFunction($start, $limit, $step = 1)
{
$result = '';
for ($i = $start; $i <= $limit; $i += $step) {
(yield $i . " ");
}
//return $result;
}
foreach (someFunction(0, 10) as $value) {
echo $value;
}
echo "<br>";
echo $memory2 . "<br>";
echo "<br><br>";
$memory = memory_get_peak_usage(true);
function someFunction2($start, $limit, $step = 1)
{
$result = '';
for ($i = $start; $i <= $limit; $i += $step) {
$result .= $i . " ";
}
return $result;
}
echo someFunction2(0, 10);
<?php
// used in callback
class X
{
function y()
{
}
}
// never used
class X2
{
function y()
{
}
}
// used but not in callback
class X3
{
function y()
{
}
}
// normal usage
array_filter(array(1, 2, 3), array('X', 'Y'));
// in a array structure, but not for callback
someFunction(array(1, 2, 3), array('X3', 'Y'));
<?php
use PHPFluent\EventManager\Manager;
require_once 'bootstrap.php';
function someFunction(Manager $eventManager)
{
echo "I'm executing\n";
echo "Some operation\n";
$eventManager->dispatchEvent("updated");
}
someFunction($eventManager);
echo file_get_contents("sample.txt") . PHP_EOL;
$eventManager->dispatchEvent("remove.file.sample.txt", array((new DateTime())->format("m/d/Y")));
<?php // Not a double assignation, since it is reprocessed $a = someFunction($b); $a = strtolower($a); // Double assignation, since it is reprocessed $a2 = someFunction($b2); $a2 = strtolower($b2);
