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<?php |
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namespace rdx\imap; |
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use rdx\imap\IMAPException; |
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use rdx\imap\IMAPTransportInterface; |
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class IMAPTransport implements IMAPTransportInterface { |
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protected $resource; // imap_open() resource |
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public function open( $server, $username, $password, $mailbox, array $flags ) { |
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if ( !empty($flags) ) { |
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$server .= '/' . implode('/', $flags); |
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} |
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$mailbox = '{' . $server . '}' . $mailbox; |
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$this->resource = @imap_open($mailbox, $username, $password); |
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if ( !$this->resource ) { |
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$error = imap_last_error(); |
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imap_errors(); |
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imap_alerts(); |
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throw new IMAPException($error); |
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} |
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return $this; |
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} |
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public function headers() { |
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return imap_headers($this->resource); |
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} |
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public function utf8( $string ) { |
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return imap_utf8($string); |
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} |
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public function headerinfo( $msgNumber ) { |
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return $this->iteratorToLowercaseArray(imap_headerinfo($this->resource, $msgNumber)); |
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} |
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public function unflag( $msgNumber, $flag ) { |
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return imap_clearflag_full($this->resource, $msgNumber, $flag); |
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} |
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public function flag( $msgNumber, $flag ) { |
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return imap_setflag_full($this->resource, $msgNumber, $flag); |
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} |
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public function fetchstructure( $msgNumber ) { |
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return imap_fetchstructure($this->resource, $msgNumber); |
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} |
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public function fetchbody( $msgNumber, $section ) { |
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return quoted_printable_decode(imap_fetchbody($this->resource, $msgNumber, $section, FT_PEEK)); |
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} |
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public function expunge() { |
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return imap_expunge($this->resource); |
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} |
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public function delete( $msgNumber ) { |
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return imap_delete($this->resource, $msgNumber); |
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} |
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public function mailboxmsginfo() { |
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return (object) $this->iteratorToLowercaseArray(imap_mailboxmsginfo($this->resource)); |
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} |
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protected function iteratorToLowercaseArray( $iterator ) { |
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$data = []; |
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foreach ( $iterator as $name => $value ) { |
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$data[ strtolower($name) ] = $value; |
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} |
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return $data; |
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} |
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} |
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If you return a value from a function or method, it should be a sub-type of the type that is given by the parent type f.e. an interface, or abstract method. This is more formally defined by the Lizkov substitution principle, and guarantees that classes that depend on the parent type can use any instance of a child type interchangably. This principle also belongs to the SOLID principles for object oriented design.
Let’s take a look at an example:
Our function
my_functionexpects aPostobject, and outputs the author of the post. The base classPostreturns a simple string and outputting a simple string will work just fine. However, the child classBlogPostwhich is a sub-type ofPostinstead decided to return anobject, and is therefore violating the SOLID principles. If aBlogPostwere passed tomy_function, PHP would not complain, but ultimately fail when executing thestrtouppercall in its body.