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<?php class MyClass { public $prop; } $foo = new MyClass(); $foo->prop = 'test1'; $bar = $foo; $bam = new MyClass(); $bam->prop = 'test2'; $t = new MyClass(); $t->prop = 'test1'; $test = array($foo, $bar, $bam, $t); function filter_them( $obj ) { static $new_arr; if ( ! in_array( $new_arr ) ){ $new_arr[] = $obj->prop; return true; } } print_r(array_filter($test, 'filter_them'));
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught ArgumentCountError: in_array() expects at least 2 arguments, 1 given in /in/QnO1B:22 Stack trace: #0 /in/QnO1B(22): in_array(NULL) #1 [internal function]: filter_them(Object(MyClass)) #2 /in/QnO1B(28): array_filter(Array, 'filter_them') #3 {main} thrown in /in/QnO1B on line 22
Process exited with code 255.

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