PHP Variable Boolean validation

Source: Internet
Author: User

true TD align= "left" >
using PHP functions to $x compare variables
An expression GetType () empty () is_null () isset () boolean : if ($x)
$x = ""; string true false true false
$x = null; null true true false false
var $x; null true true false false
$x  is undefined true false false
$x = Array (); array true false true false
$x = false; boolean true false true false
$x = true; boolean false false true true
$x = 1; integer false false true true
$x =; integer false false true true
$x = 0; integer true false true false
$x =-1; integer false false true true
$x = "1"; string false false true true
$x = "0"; string true false true false
$x = "1"; string false false true true
$x = "php"; string false false true true
$x = "true"; string false false true true
$x = "false"; String FALSE FALSE TRUE TRUE

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PHP Variable Boolean validation

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