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@ 2015-10-27T16:03:15Z

<?php
class Foo { public $bar; }
$foo = new Foo;
$arr = array(
    "string(empty) \"\"" => "", 
    "string(space) \" \"" => " ", 
    "bool(false)" => FALSE, 
    "bool(true)" => TRUE, 
    "array(empty) {}" => array(), 
    "NULL" => NULL, 
    "string(\"zero\") \"0\"" => "0", 
    "int(0)" => 0, 
    "float(0.0)" => 0.0, 
    "object(stdClass)# (empty) {}" => new stdClass, 
    "public \$bar" => $foo->bar, 
    "string(null byte) \"\\0\"" => "\0"
);


define('PAD', array_map('strlen', $arr));
$headings = array('type', 'if', 'isset', 'empty', 'is_null');
// foreach($headings as $heading){ echo str_pad($heading, PAD), " | "; }
echo "\n";

$x = str_pad("TRUE", PAD) . " | ";
$y = str_pad("", PAD) . " | ";

foreach($arr as $key => $val){
    echo str_pad($key, PAD), " | ";
    echo $val ? $x : $y;
    echo isset($val) ? $x : $y;
    echo empty($val) ? $x : $y;
    echo is_null($val) ? $x : $y;
    echo "\n";
}

Output for git.master, git.master_jit, rfc.property-hooks: Fatal error: Uncaught TypeError: strlen(): Argument #1 ($string) must be of type string, array given in /in/qRYJ7:20 Stack trace: #0 [internal function]: strlen(Array) #1 /in/qRYJ7(20): array_map('strlen', Array) #2 {main} thrown in /in/qRYJ7 on line 20
Process exited with code 255.

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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