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      PHP foreach 只返回鍵

      PHP foreach that returns keys only(PHP foreach 只返回鍵)

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              1. 本文介紹了PHP foreach 只返回鍵的處理方法,對(duì)大家解決問題具有一定的參考價(jià)值,需要的朋友們下面隨著小編來(lái)一起學(xué)習(xí)吧!

                問題描述

                可能沒有任何意義但仍然可能有一個(gè)聰明的答案的理論問題.

                Theoretical question that perhaps does not make any sense but still, maybe there is a clever answer.

                我想遍歷數(shù)組并獲取它的鍵和帶有它們的東西.我所做的一個(gè)簡(jiǎn)單的例子:

                I want to iterate through array and get its keys and to something with them. A quick example of what I do:

                foreach($array as $key => $value) {
                    $other_array[$key] = 'something';
                }
                

                現(xiàn)在,PHP Mess Detector 尖叫著 $value 在此范圍內(nèi)未使用.因此,我在想,這可能不是訪問我的 arraykeys 的最佳方式.

                Now, PHP Mess Detector screams that $value is unused in this scope. Therefore I was thinking that perhaps this is not the best way to access keys of my array.

                知道如何在不不必要地從我的 array 中取出 values 的情況下做到這一點(diǎn)嗎?它是否有任何顯著的性能影響......或者我可能只是偏執(zhí),應(yīng)該繼續(xù)而不用浪費(fèi)任何人的時(shí)間來(lái)回答愚蠢的問題:)

                Any idea how to do it without unnecessarily taking out values out of my array? Does it have any significant performance impact ... or perhaps I am just being paranoid and should carry on without wasting anyone's time with stupid questions :).

                推薦答案

                你可以這樣做

                foreach(array_keys($array) as $key) {
                 // do your stuff
                }
                

                這將使 foreach 迭代由數(shù)組中的鍵而不是實(shí)際數(shù)組組成的數(shù)組.請(qǐng)注意,從性能的角度來(lái)看,它可能不會(huì)更好.

                That would make the foreach iterate over an array consisting of the keys from your array instead of the actual array. Note that it's probably not better from a performance standpoint though.

                這篇關(guān)于PHP foreach 只返回鍵的文章就介紹到這了,希望我們推薦的答案對(duì)大家有所幫助,也希望大家多多支持html5模板網(wǎng)!

                【網(wǎng)站聲明】本站部分內(nèi)容來(lái)源于互聯(lián)網(wǎng),旨在幫助大家更快的解決問題,如果有圖片或者內(nèi)容侵犯了您的權(quán)益,請(qǐng)聯(lián)系我們刪除處理,感謝您的支持!

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