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ini_set(‘display_errors, 1); error_reporting(E_ALL);   The ini_set function sets a configuration option for the duration of the script execution. When the script is done, the value returns to whatever it was set to originally in the ini file. The error_reporting function

$x = NULL; if (‘0xFF’ == 255) { $x = (int)’0xFF’; } This problem tests your knowledge of how type juggling, or coercion works. When a string and a number are compared with the equality operator, the string is coerced

$x = true and false; var_dump($x); This one is interesting. In PHP, you can use && or and to do a logical comparison. However, due to the Operator Precedence rules, and actually has lower precedence than =, where && has higher!

$arr = array(); $arr[‘val1’] = array(1, 2); $arr[‘val2’] = 3; $arr[‘val3’] = array(4, 5); $arr2 = array(); $arr2 = array_merge($arr2, $arr[‘val1’]); var_dump($arr2); $arr2 = array_merge($arr2, $arr[‘val2’]); var_dump($arr2); $arr2 = array_merge($arr2, $arr[‘val3′]); var_dump($arr2); There’s a problem with this code. It lies

var_dump(0123 == 123); var_dump(‘0123’ == 123); var_dump(‘0123’ === 123); At first glance one might think that the leading zero on line one is simply of no value. But one would be wrong… In PHP, a leading zero in a number

$string1 = ‘php is fun!’; $string2 = ‘php’; if (strpos($string1,$string2)) { echo “\”” . $string1 . “\” contains \”” . $string2 . “\””; } else { echo “\”” . $string1 . “\” does not contain \”” . $string2 . “\””;

Today I saw an interesting problem. At first glance I wasn’t sure what I was looking at. It took me a moment to parse it. Here is my own version of the problem: $x = 3; echo $x; echo “<br