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<?php $tags = ' #portugal #sagres #cabodesaovicente #love #travel #couple #holiday #vacation #ig_europe #landmark #reflections #ocean #europe #sky #reflection #water #people #sea #pretty #fun #beach #house #village #topeuropephotos #photo #photos #cloud #stone #sunset ' ; $pcs = array_map('trim', explode('#', $tags)); $found=[]; foreach($pcs as $piece){ if (array_key_exists($piece, $found)){ var_dump("tag already found: $piece"); continue; } $found[$piece]=true; } var_dump("found ".count($found)." tags");
Output for git.master, git.master_jit, rfc.property-hooks
string(13) "found 30 tags"

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