Question

given a string :

The [[Pulsatile_flow|pulsatile]]
nature of blood flow creates a pulse
wave that is propagated down the
[[arterial tree]], and at
[[Aortic_bifurcation|bifurcations]]
reflected waves rebound to return to
semilunar valves and the origin of the
[[aorta]]. These return waves create
the
[[Dicrotic_notch#Ventricular_systole|dicrotic
notch]] displayed in the aortic
pressure curve during the [[cardiac
cycle]] as these reflected waves push
on the [[heart valve|aortic semilunar
valve]].[[Wiktionary:aorta|]]

how could i extract ALL words/phrases enclosed in ‘[[ ]]’ and put then in an array using php.

with condition :
if “|” exist retrieve only words after “|” if no words exist after “|” retrieve the words before “|” but after “:” .
words in parenthesis will also be disregarded.

example

[[aorta]]                              => retrieve aortal

[[Pulsatile_flow|pulsatile]]           => retrieve only pulsatile

[[Pulsatile_flow|pulsatile (temp)]]    => retrieve only pulsatile

[[Wiktionary:aorta|Aorta Topic]]       => retrieve Aorta Topic

[[Wiktionary:aorta|]]                  => retrieve aorta

[[aorta|]]                             => retrieve aorta

if “|” did not exists retrieve all

 [[Wiktionary:aorta]]  => retrieve Wiktionary:aorta

Answer 1

Check this out:

$results = array();
$source = "The [[Pulsatile_flow|pulsatile]] nature of blood flow creates a pulse wave that is propagated down the [[arterial tree]], and at [[Aortic_bifurcation|bifurcations]] reflected waves rebound to return to semilunar valves and the origin of the [[aorta]]. These return waves create the [[Dicrotic_notch#Ventricular_systole|dicrotic notch]] displayed in the aortic pressure curve during the [[cardiac cycle]] as these reflected waves push on the [[heart valve|aortic semilunar valve]].[[Wiktionary:aorta|]]";
if ( preg_match_all('/\[\[(.*?)\]\]/is', $source, $matches) ) 
{
    foreach ( $matches[1] as $match ) 
    {
        if ( strpos( $match, '|' ) === false ) {
            $results[] = $match;
        } else {
            $parts = explode( '|', $match );
            if ( empty( $parts[1] ) ) {
                $parts = explode( ':', $parts[0] );
                $results[] = count( $parts ) == 2 ? $parts[1] : $parts[0];
            } else {
                $results[] = preg_replace( '/\(.*?\)/is', '', $parts[1] );
            }
        }
    }
}

var_dump( $results );