替换某个字符串中的一个或若干个字串为数组中某些值
php本身有自带的函数，可以不用循环非常高效的实现其效果：
实例代码：
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1
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$phrase
= "You should eat fruits , vegetables, and fiber every day.";<br> $healthy
= array("fruits", "vegetables", "fiber");<br> $yummy
= array("pizza", "beer","banana"
);<br><br> $newphrase
= str_replace($healthy, $yummy, $phrase);<br>
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print_r($newphrase);结果显示为：
You should eat pizza , beer, and banana every day.