#php nuances - stuff that are not quite obvious

php-nuances

Case sensitive VS insensitive
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From: http://stackoverflow.com/a/20624302/3540661

Case sensitive (both user defined and PHP defined)

variables
constants
array keys
class properties
class constants

Case insensitive (both user defined and PHP defined)
functions
class constructors
class methods
keywords and constructs (if, else, null, foreach, echo etc.)


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following are considered false when converted to boolean
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array()
""
"0"
0
0.0
NULL or null or unset variables
false
object with no property (PHP 4 only)