<?php
function doStuff($s)
{
return ".";
}
// Dont change below here
// =============================================
assert(doStuff(1) == ".\n.", "Nope! Should be \".\n.\"");
echo "=========================================";
assert(doStuff(3) == "...\n.\n.\n.", "Nope! Should be \"...\n.\n.\n.\"");
echo "=========================================";
assert(doStuff(5) == ".....\n.\n.\n.\n.\n.", "Nope! Should be \"...\n.\n.\n.\n.\n.\"");
// =============================================
<?php
function doStuff()
{
// do stuff
echo '<p>Message</p>';
}
doStuff();
function doOtherStuff()
{
return 'Message';
}
echo '<p>' . doOtherStuff() . '</p>';
function doMoreStuff($message = 'default message')
{
return '<p>' . $message . '</p>';
}
echo '<p>' . doMoreStuff() . '</p>';
echo '<p>' . doMoreStuff('This space for rent.') . '</p>';
function foo($a, $b = 0)
{
$c = $a * $b;
// $c is inside function scope
return $c;
}
$c = 10;
// global scope
echo '<p>' . $c . '</p>';
echo '<p>' . foo(10, 5) . '</p>';
echo '<p>' . $c . '</p>';
// $c is unchanged
<?php
function doStuff($message)
{
return '<p>' . $message . '</p>';
}
echo doStuff('This is a message.');
<?php
/*
* * Pollute the heap. Helps trigger bug. Sometimes not needed.
* */
class A
{
function __construct()
{
$a = 'AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAa';
$this->a = $a . $a . $a . $a . $a . $a;
}
}
function doStuff($limit)
{
$a = new A();
$b = array();
for ($i = 0; $i < $limit; $i++) {
$b[$i] = clone $a;
}
unset($a);
gc_collect_cycles();
}
$iterations = 3;
doStuff($iterations);
doStuff($iterations);
gc_collect_cycles();
print_r(exif_read_data(__DIR__ . '/bug68799.jpg'));
<?php
// assign default values to parameters (making them optional)
// inside the parameter block; they become optional params.
// note that optional parameters MUST come after required params
function doStuff($message, $element = 'p')
{
return '<' . $element . '>' . $message . '</' . $element . '>';
}
echo doStuff('This space for rent');
// a good practice is to pass in an associative array
// containing all the function parameters when there are
// many parameters a function may require.
function doStuffBetter($options = array())
{
// define default parameters inside function
if (empty($options['message'])) {
$options['message'] = 'This space for rent.';
}
$options['element'] = empty($options['element']) ? 'p' : $options['element'];
return '<' . $options['element'] . '>' . $options['message'] . '</' . $options['element'] . '>';
}
echo doStuffBetter(array('element' => 'h2', 'message' => 'Another sample message.'));
echo doStuffBetter(array('element' => 'h2'));
<?php
function doStuff($x, $y, $z)
{
return null;
}
// Dont change below here
// =============================================
assert(doStuff(1, 2, 3) == 6, "1) Nope!");
assert(doStuff(1000, 2, 3) == 6000, "2) Nope!");
assert(doStuff(59, 4, 89) == 21004, "3) Nope!");
// =============================================
<?php
$string = 'dsfhlksdnhdnshsdhs';
function doStuff(&$string)
{
$string = 'NOT THE ORIGINAL';
}
doStuff($string);
echo $string, "\n";
$class = new stdClass();
$class->prop = 'value';
function doStuffOnObject($class)
{
$class->prop = 'newVal';
}
doStuffOnObject($class);
echo $class->prop, "\n";
$items = array(array('id' => 1), array('id' => 2));
foreach ($items as &$item) {
$item['new'] = 'sdnfhkdsnlhs';
}
var_export($items);
