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|
--TEST--
Test key() function : usage variations
--FILE--
<?php
/*
* Pass arrays where keys are different data types as $array_arg to key() to test behaviour
*/
echo "*** Testing key() : usage variations ***\n";
//get an unset variable
$unset_var = 10;
unset ($unset_var);
// heredoc string
$heredoc = <<<EOT
hello world
EOT;
// unexpected values to be passed as $array_arg
$inputs = array(
// int data
/*1*/ 'int' => array(
0 => 'zero',
1 => 'one',
12345 => 'positive',
-2345 => 'negative',
),
// null data
/*4*/ 'null uppercase' => array(
NULL => 'null 1',
),
/*5*/ 'null lowercase' => array(
null => 'null 2',
),
// boolean data
/*6*/ 'bool lowercase' => array(
true => 'lowert',
false => 'lowerf',
),
/*7*/ 'bool uppercase' => array(
TRUE => 'uppert',
FALSE => 'upperf',
),
// empty data
/*8*/ 'empty double quotes' => array(
"" => 'emptyd',
),
/*9*/ 'empty single quotes' => array(
'' => 'emptys',
),
// string data
/*10*/ 'string' => array(
"stringd" => 'stringd',
'strings' => 'strings',
$heredoc => 'stringh',
),
// undefined data
/*11*/ 'undefined' => array(
@$undefined_var => 'undefined',
),
// unset data
/*12*/ 'unset' => array(
@$unset_var => 'unset',
),
);
// loop through each element of $inputs to check the behavior of key()
$iterator = 1;
foreach($inputs as $key => $input) {
echo "\n-- Iteration $iterator : $key data --\n";
while (key($input) !== NULL) {
var_dump(key($input));
next($input);
}
$iterator++;
};
?>
--EXPECT--
*** Testing key() : usage variations ***
-- Iteration 1 : int data --
int(0)
int(1)
int(12345)
int(-2345)
-- Iteration 2 : null uppercase data --
string(0) ""
-- Iteration 3 : null lowercase data --
string(0) ""
-- Iteration 4 : bool lowercase data --
int(1)
int(0)
-- Iteration 5 : bool uppercase data --
int(1)
int(0)
-- Iteration 6 : empty double quotes data --
string(0) ""
-- Iteration 7 : empty single quotes data --
string(0) ""
-- Iteration 8 : string data --
string(7) "stringd"
string(7) "strings"
string(11) "hello world"
-- Iteration 9 : undefined data --
string(0) ""
-- Iteration 10 : unset data --
string(0) ""
|
