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PHP array_diff() 函数
tryphp_func_array_diff
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<!DOCTYPE html> <html> <body> <?php $a1=array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow"); $a2=array("e"=>"red","f"=>"green","g"=>"blue"); $result=array_diff($a1,$a2); print_r($result); ?> </body> </html>