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<?php $test = array( NAN ); function array_is_list_1( $arr ) { if ( ( array() === $arr ) ) { return true; } if ( ( array_values( $arr ) === $arr ) ) { return true; } return false; } var_dump(array_values( array( NAN ) ) === array( NAN ) ); // false var_dump( array() === array( NAN ) ); // false var_dump( array_is_list_1( $test ) ); // false on PHP 7.0 and PHP 7.1. true on PHP 7.2+
Output for git.master, git.master_jit, rfc.property-hooks
bool(false) bool(false) bool(true)

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