这句搞定它:
$array = [ ['searchid' => 3965,'keywords' => '皇后'], ['searchid' => 3964,'keywords' => '娘娘'], ['searchid' => 3963,'keywords' => '岁岁'], ['searchid' => 3962,'keywords' => '光速捷婚'], ['searchid' => 3961,'keywords' => '国民崽崽被读心后'], ['searchid' => 3960,'keywords' => '人在星铁'], ['searchid' => 3959,'keywords' => '希腊神话'] ];
echo implode(',', array_column($array, 'keywords'));
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