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<?php $credentials = array(); var_dump( $credentials['user_login'] ); var_dump( array( &$credentials['user_login'] ) ); var_dump( $credentials['user_login'] );
Output for rfc.property-hooks, git.master, git.master_jit
Warning: Undefined array key "user_login" in /in/8JMRM on line 4 NULL array(1) { [0]=> &NULL } NULL

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