strcmp() null null b false
 b true
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 0
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 13369593
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 57
 1.3
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 0
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 NAN
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 ‘null’
 ‘123str’
 ‘str123’
 ‘123, "str"’
 ‘0xCC00F9’
 ‘0123’
 array()
 Array(…) Array(…) Object(…) Object(…) Resource id #10
 Object(…) Object(…) Object(…) Object(…) Object(…) strcmp()
strcmp() null null b false
 b true
 1
 0
 -1
 42
 13369593
 42
 57
 1.3
 0.005
 0
 -1.3
 NAN
 NAN
 -INF
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 123450000
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 ‘-1’
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 ‘-1.305’
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 ‘false’
 ‘null’
 ‘123str’
 ‘str123’
 ‘123, "str"’
 ‘0xCC00F9’
 ‘0123’
 array()
 Array(…) Array(…) Object(…) Object(…) Resource id #10
 Object(…) Object(…) Object(…) Object(…) Object(…) strcmp()
null : ( = NULL )
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array()
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( #3 ) 		null
( #3 ) 		null
( #3 ) 		Array: (
    [1 (int)] => string[6] : ‘string’
)
Array: (
    [0 (int)] => bool : ( = false )
    [1 (int)] => int : 1
    [2 (int)] => float : 1.3
    [3 (int)] => string[6] : ‘123str’
    [4 (int)] => string[6] : ‘str123’
    [5 (int)] => null : ( = NULL )
)
 null
( #1 )
( #3 ) 		null
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( #3 ) 		null
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( #3 ) 		null
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( #3 ) 		null
( #3 ) 		null
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( #3 ) 		null
( #3 ) 		null
( #3 ) 		null
( #3 ) 		null
( #3 ) 		null
( #3 ) 		null
( #3 ) 		null
( #3 ) 		null
( #3 ) 		null
( #3 ) 		null
( #3 ) 		null
( #3 ) 		null
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( #3 ) 		null
( #3 ) 		null
( #3 ) 		null
( #3 ) 		null
( #3 ) 		null
( #3 ) 		Array: (
    [0 (int)] => bool : ( = false )
    [1 (int)] => int : 1
    [2 (int)] => float : 1.3
    [3 (int)] => string[6] : ‘123str’
    [4 (int)] => string[6] : ‘str123’
    [5 (int)] => null : ( = NULL )
)
Object: (
    Class: stdClass (
    )
)
 null
( #1 )
( #3 ) 		null
( #3 ) 		null
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( #3 ) 		null
( #3 ) 		null
( #3 ) 		null
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( #3 ) 		null
( #3 ) 		null
( #3 ) 		null
( #3 ) 		null
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( #3 ) 		null
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( #3 ) 		null
( #3 ) 		null
( #3 ) 		null
( #3 ) 		null
( #3 ) 		null
( #3 ) 		Object: (
    Class: stdClass (
    )
)
Object: (
    Class: TestObjectToString (
        property: test3 = string[11] : ‘some string’
        property: test1 = null : ( = NULL )
        property: test2 = bool : 1 ( = true )
        method: __toString
        method: print_it
    )
)
 11
( #1 ) 		11 11 66 66 67 4603454 4144445 66 4144445 4077624 4342074 1 67 1 2436639 2436639 1 2760999 66 11 83 5455422 5454925 66 67 4603454 4144445 4342074 4407613 1 -1 1 1 1 -1 66 67 1 null
( #2 ) 		null
( #2 ) 		null
( #2 ) 		null
( #2 ) 		0 null
( #2 ) 		11 66 3816251 1 32 Object: (
    Class: TestObjectToString (
        property: test3 = string[11] : ‘some string’
        property: test1 = null : ( = NULL )
        property: test2 = bool : 1 ( = true )
        method: __toString
        method: print_it
    )
)
resource : Resource id #10 ( = RESOURCE )
 null
( #1 )
( #3 ) 		null
( #3 ) 		null
( #3 ) 		null
( #3 ) 		null
( #3 ) 		null
( #3 ) 		null
( #3 ) 		null
( #3 ) 		null
( #3 ) 		null
( #3 ) 		null
( #3 ) 		null
( #3 ) 		null
( #3 ) 		null
( #3 ) 		null
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( #3 ) 		null
( #3 ) 		null
( #3 ) 		null
( #3 ) 		null
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( #3 ) 		null
( #3 ) 		null
( #3 ) 		null
( #3 ) 		null
( #3 ) 		null
( #3 ) 		null
( #3 ) 		null
( #3 ) 		null
( #3 ) 		null
( #3 ) 		null
( #3 ) 		null
( #3 ) 		null
( #3 ) 		null
( #3 ) 		null
( #3 ) 		null
( #3 ) 		null
( #3 ) 		null
( #3 ) 		null
( #3 ) 		null
( #3 ) 		null
( #3 ) 		null
( #3 ) 		null
( #3 ) 		null
( #3 ) 		null
( #3 ) 		null
( #3 ) 		null
( #3 ) 		null
( #3 ) 		null
( #3 ) 		null
( #3 ) 		resource : Resource id #10 ( = RESOURCE )
Object: (
    Class: SplBool (
        property: __default = bool : ( = false )
        method: getConstList
        method: __construct
    )
)
 0
( #1 ) 		0 0 -1 -1 -1 -2 -2 -8 -2 -2 -3 -5 -1 -4 -3 -3 -4 -3 -9 0 -1 -2 -3 -1 -1 -2 -2 -3 -3 -6 -4 -5 -4 -6 -6 -10 -8 -4 null
( #2 ) 		null
( #2 ) 		null
( #2 ) 		null
( #2 ) 		-11 null
( #2 ) 		0 -1 -2 -5 -9 Object: (
    Class: SplBool (
        property: __default = bool : ( = false )
        method: getConstList
        method: __construct
    )
)
Object: (
    Class: SplBool (
        property: __default = bool : 1 ( = true )
        method: getConstList
        method: __construct
    )
)
 1
( #1 ) 		1 1 0 0 1 4 -3 -7 -3 -4 -2 1 1 4 -29 -29 4 -24 -8 1 17 17 17 0 1 4 -3 -2 1 4 -67 -53 -61 -5 -66 -9 1 1 null
( #2 ) 		null
( #2 ) 		null
( #2 ) 		null
( #2 ) 		-66 null
( #2 ) 		1 0 -8 -2 -34 Object: (
    Class: SplBool (
        property: __default = bool : 1 ( = true )
        method: getConstList
        method: __construct
    )
)
Object: (
    Class: SplInt (
        property: __default = int : 94
        method: __construct
    )
)
 2
( #1 ) 		2 2 8 8 9 787203 328194 524545 328194 261373 525830 591366 9 787203 -1379597 -1379597 781035 -1055258 524802 2 25 1639171 1638657 8 9 787203 328194 525830 591366 787203 -3882558 -2960685 -3490113 524802 -3817536 524802 572348 590595 null
( #2 ) 		null
( #2 ) 		null
( #2 ) 		null
( #2 ) 		-3816251 null
( #2 ) 		2 8 0 394758 -1711132 Object: (
    Class: SplInt (
        property: __default = int : 94
        method: __construct
    )
)
Object: (
    Class: SplFloat (
        property: __default = float : 3.154
        method: __construct
    )
)
 5
( #1 ) 		5 5 2 2 3 392445 -66564 1 -66564 -133385 131070 1 3 1 -1774365 -1774365 1 -1450005 1 5 19 1244413 1243921 2 3 392445 -66564 131070 196609 1 -1 -1 -1 1 -1 1 1 1 null
( #2 ) 		null
( #2 ) 		null
( #2 ) 		null
( #2 ) 		-1 null
( #2 ) 		5 2 -394758 0 -1 Object: (
    Class: SplFloat (
        property: __default = float : 3.154
        method: __construct
    )
)
Object: (
    Class: SplString (
        property: __default = string[9] : ‘SPLstring’
        method: __construct
    )
)
 9
( #1 ) 		9 9 34 34 35 2498335 2039326 34 2039326 1972505 2236953 1 35 1 331518 331518 1 655878 34 9 51 3350303 3349804 34 35 2498335 2039326 2236953 2302492 1 -1 -1 -1 1 -1 34 35 1 null
( #2 ) 		null
( #2 ) 		null
( #2 ) 		null
( #2 ) 		-32 null
( #2 ) 		9 34 1711132 1 0 Object: (
    Class: SplString (
        property: __default = string[9] : ‘SPLstring’
        method: __construct
    )
)
  1. Notice: Undefined index: notset
  2. Warning: strcmp() expects parameter 2 to be string, array/object/resource given
  3. Warning: strcmp() expects parameter 1 to be string, array/object/resource given