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<?php $test = array("", NULL, 0, 1, "0", "1", true, false, new stdClass(), array(1), array()); echo "X\t!!(x)\t(x==true)\t(x===true)=\n\n"; foreach($test as $t) { echo var_export($t, true) . "\t" . var_export((!!$t), true) . "\t" . var_export(($t==true),true). "\t" . var_export(($t===true),true). "\n"; }
Output for git.master, git.master_jit, rfc.property-hooks
X !!(x) (x==true) (x===true)= '' false false false NULL false false false 0 false false false 1 true true false '0' false false false '1' true true false true true true true false false false false (object) array( ) true true false array ( 0 => 1, ) true true false array ( ) false false false

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