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<?php class Invariant{ private $value; private $check; private $description; function __construct($check, $description){ $this->check = $check; $this->description = $description; } function set($value){ $check = $this->check; if($check($value)){ $this->value = $value; }else{ trigger_error("Invariant ".$this->description." violated.", E_USER_ERROR); } } function get(){ return $this->value; } } class A{ protected $a; function __construct(){ $this->a = new Invariant(function($value){return $value > 100;}, '$this->a > 100'); } } class B extends A{ function __construct(){ parent::__construct(); $this->a->set(10); //error $this->a->set(101); //that's ok } } $b = new B();
Output for 8.5.0
Deprecated: Passing E_USER_ERROR to trigger_error() is deprecated since 8.4, throw an exception or call exit with a string message instead in /in/vjBRG on line 17 Fatal error: Invariant $this->a > 100 violated. in /in/vjBRG on line 17 Stack trace: #0 /in/vjBRG(17): trigger_error('Invariant $this...', 256) #1 /in/vjBRG(34): Invariant->set(10) #2 /in/vjBRG(38): B->__construct() #3 {main}
Process exited with code 255.
Output for 8.4.15
/bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.35' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.34' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15)
Process exited with code 1.
Output for 8.4.1 - 8.4.14
Deprecated: Passing E_USER_ERROR to trigger_error() is deprecated since 8.4, throw an exception or call exit with a string message instead in /in/vjBRG on line 17 Fatal error: Invariant $this->a > 100 violated. in /in/vjBRG on line 17
Process exited with code 255.
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.28
Fatal error: Invariant $this->a > 100 violated. in /in/vjBRG on line 17
Process exited with code 255.
Output for 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION, expecting ')' in /in/vjBRG on line 28
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_FUNCTION, expecting ')' in /in/vjBRG on line 28
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/vjBRG on line 4
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1
Parse error: parse error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/vjBRG on line 4
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `T_OLD_FUNCTION' or `T_FUNCTION' or `T_VAR' or `'}'' in /in/vjBRG on line 4
Process exited with code 255.
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