求助:实现返回前一页的代码?

求助,同上。PHP的代码能实现吗?怎么编写,请提示!若不行,其它能实现这个功能能在PHP中使用的嵌入语言的代码怎么编写?
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1<a href="#" onclick="javascript:history.back();">返回</a>

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1<script>   
2window.history.go(-1)   
3//window.history.back()   
4</script>
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