booleantrue/falseandthestrings"true"/"false".-PHP源码
Booleans and NULL $bool1:
$bool2:
$var1 is set:
$var2 is set:
$var3 is set:
$var1 is set:
$var2 is set:
$var3 is set:
$var1 empty:
$var4 empty:
Booleans and NULL $bool1:
$bool2:
$var1 is set:
$var2 is set:
$var3 is set:
$var1 is set:
$var2 is set:
$var3 is set:
$var1 empty:
$var4 empty:
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