현재 위치: > 함수 카테고리 모음> array_map

array_map

배열의 각 요소에 콜백 함수 적용
이름:array_map
분류:정렬
사용 언어:php
한 줄 설명:배열의 각 값을 사용자 정의 함수로 보내고 새 값을 반환하십시오.

예 1

배열의 각 값에 함수를 적용하고 각 값을 자체적으로 곱한 다음 새 값으로 배열을 반환합니다.

 <span class="token php language-php"><span class="token delimiter important"><? php</span>
<span class="token keyword">기능</span> <span class="token function-definition function">myfunction</span> <span class="token punctuation">(</span> <span class="token variable">$ V</span> <span class="token punctuation">)</span>
<span class="token punctuation">{</span>
  <span class="token keyword">반품</span> <span class="token punctuation">(</span> <span class="token variable">$ V</span> <span class="token operator">*</span> <span class="token variable">$ V</span> <span class="token punctuation">)</span> <span class="token punctuation">;</span>
<span class="token punctuation">}</span>

<span class="token variable">$ a</span> <span class="token operator">=</span> <span class="token keyword">배열</span> <span class="token punctuation">(</span> <span class="token number">1</span> <span class="token punctuation">,</span> <span class="token number">2</span> <span class="token punctuation">,</span> <span class="token number">3</span> <span class="token punctuation">,</span> <span class="token number">4</span> <span class="token punctuation">,</span> <span class="token number">5</span> <span class="token punctuation">)</span> <span class="token punctuation">;</span>
<span class="token function">print_r</span> <span class="token punctuation">(</span><span class="token function"></span></span><mark> <span class="token function">Array_map</span> <span class="token punctuation">(</span> <span class="token string double-quoted-string">"myfunction"</span> <span class="token punctuation">,</span> <span class="token variable">$ a</span> <span class="token punctuation">)</span></mark><span class="token punctuation"></span> <span class="token punctuation">)</span> <span class="token punctuation">;</span>
<span class="token delimiter important">?></span>

직접 시도하십시오

예 2

사용자 정의 함수를 사용하여 배열 값을 변경하십시오.

 <span class="token php language-php"><span class="token delimiter important"><? php</span>
<span class="token keyword">기능</span> <span class="token function-definition function">myfunction</span> <span class="token punctuation">(</span> <span class="token variable">$ V</span> <span class="token punctuation">)</span>
<span class="token punctuation">{</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span> <span class="token variable">$ v</span> <span class="token operator">===</span> <span class="token string double-quoted-string">"dog"</span> <span class="token punctuation">)</span>
  <span class="token punctuation">{</span>
  <span class="token string double-quoted-string">"Fido"를</span> <span class="token keyword">반환합니다</span> <span class="token punctuation">.</span>
  <span class="token punctuation">}</span>
<span class="token keyword">return</span> <span class="token variable">$ v</span> <span class="token punctuation">;</span>
<span class="token punctuation">}</span>

<span class="token variable">$ a</span> <span class="token operator">=</span> <span class="token keyword">배열</span> <span class="token punctuation">(</span> <span class="token string double-quoted-string">"말"</span> <span class="token punctuation">,</span> <span class="token string double-quoted-string">"개"</span> <span class="token punctuation">,</span> <span class="token string double-quoted-string">"고양이"</span> <span class="token punctuation">)</span> <span class="token punctuation">;</span>
<span class="token function">print_r</span> <span class="token punctuation">(</span><span class="token function"></span></span><mark> <span class="token function">Array_map</span> <span class="token punctuation">(</span> <span class="token string double-quoted-string">"myfunction"</span> <span class="token punctuation">,</span> <span class="token variable">$ a</span> <span class="token punctuation">)</span></mark><span class="token punctuation"></span> <span class="token punctuation">)</span> <span class="token punctuation">;</span>
<span class="token delimiter important">?></span>

직접 시도하십시오

예 3

두 배열 사용 :

 <span class="token php language-php"><span class="token delimiter important"><? php</span>
<span class="token keyword">함수</span> <span class="token function-definition function">myfunction</span> <span class="token punctuation">(</span> <span class="token variable">$ v1</span> <span class="token punctuation">,</span> <span class="token variable">$ v2</span> <span class="token punctuation">)</span>
<span class="token punctuation">{</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span> <span class="token variable">$ v1</span> <span class="token operator">===</span> <span class="token variable">$ v2</span> <span class="token punctuation">)</span>
  <span class="token punctuation">{</span>
  <span class="token string double-quoted-string">"동일"을</span> <span class="token keyword">반환합니다</span> <span class="token punctuation">.</span>
  <span class="token punctuation">}</span>
<span class="token string double-quoted-string">"다른"</span> <span class="token keyword">반환</span> <span class="token punctuation">;</span>
<span class="token punctuation">}</span>

<span class="token variable">$ a1</span> <span class="token operator">=</span> <span class="token keyword">배열</span> <span class="token punctuation">(</span> <span class="token string double-quoted-string">"말"</span> <span class="token punctuation">,</span> <span class="token string double-quoted-string">"개"</span> <span class="token punctuation">,</span> <span class="token string double-quoted-string">"고양이"</span> <span class="token punctuation">)</span> <span class="token punctuation">;</span>
<span class="token variable">$ a2</span> <span class="token operator">=</span> <span class="token keyword">배열</span> <span class="token punctuation">(</span> <span class="token string double-quoted-string">"cow"</span> <span class="token punctuation">,</span> <span class="token string double-quoted-string">"dog"</span> <span class="token punctuation">,</span> <span class="token string double-quoted-string">"rat"</span> <span class="token punctuation">)</span> <span class="token punctuation">;</span>
<span class="token function">print_r</span> <span class="token punctuation">(</span><span class="token function"></span></span><mark> <span class="token function">Array_map</span> <span class="token punctuation">(</span> <span class="token string double-quoted-string">"myfunction"</span> <span class="token punctuation">,</span> <span class="token variable">$ a1</span> <span class="token punctuation">,</span> <span class="token variable">$ a2</span> <span class="token punctuation">)</span></mark><span class="token punctuation"></span> <span class="token punctuation">)</span> <span class="token punctuation">;</span>
<span class="token delimiter important">?></span>

직접 시도하십시오

예 4

배열의 값의 모든 문자를 대문자로 변경하십시오.

 <span class="token php language-php"><span class="token delimiter important"><? php</span>
<span class="token keyword">기능</span> <span class="token function-definition function">myfunction</span> <span class="token punctuation">(</span> <span class="token variable">$ V</span> <span class="token punctuation">)</span>
<span class="token punctuation">{</span>
<span class="token variable">$ v</span> <span class="token operator">=</span> <span class="token function">strtoupper</span> <span class="token punctuation">(</span> <span class="token variable">$ V</span> <span class="token punctuation">)</span> <span class="token punctuation">;</span>
  <span class="token keyword">return</span> <span class="token variable">$ v</span> <span class="token punctuation">;</span>
<span class="token punctuation">}</span>

<span class="token variable">$ a</span> <span class="token operator">=</span> <span class="token keyword">배열</span> <span class="token punctuation">(</span> <span class="token string double-quoted-string">"동물"</span> <span class="token operator">=></span> <span class="token string double-quoted-string">"말"</span> <span class="token punctuation">,</span> <span class="token string double-quoted-string">"type"</span> <span class="token operator">=></span> <span class="token string double-quoted-string">"포유류"</span> <span class="token punctuation">)</span> <span class="token punctuation">;</span>
<span class="token function">print_r</span> <span class="token punctuation">(</span> <span class="token function">array_map</span> <span class="token punctuation">(</span> <span class="token string double-quoted-string">"myfunction"</span> <span class="token punctuation">,</span> <span class="token variable">$ a</span> <span class="token punctuation">)</span> <span class="token punctuation">)</span> <span class="token punctuation">;</span>
<span class="token delimiter important">?></span></span>

직접 시도하십시오

예 5

함수 이름을 null에 할당 할 때 :

 <span class="token php language-php"><span class="token delimiter important"><? php</span>
<span class="token variable">$ a1</span> <span class="token operator">=</span> <span class="token keyword">배열</span> <span class="token punctuation">(</span> <span class="token string double-quoted-string">"개"</span> <span class="token punctuation">,</span> <span class="token string double-quoted-string">"고양이"</span> <span class="token punctuation">)</span> <span class="token punctuation">;</span>
<span class="token variable">$ a2</span> <span class="token operator">=</span> <span class="token keyword">배열</span> <span class="token punctuation">(</span> <span class="token string double-quoted-string">"강아지"</span> <span class="token punctuation">,</span> <span class="token string double-quoted-string">"고양이"</span> <span class="token punctuation">)</span> <span class="token punctuation">;</span>
<span class="token function">print_r</span> <span class="token punctuation">(</span><span class="token function"></span></span><mark> <span class="token function">Array_map</span> <span class="token punctuation">(</span> <span class="token constant">NULL</span> <span class="token punctuation">,</span> <span class="token variable">$ a1</span> <span class="token punctuation">,</span> <span class="token variable">$ a2</span> <span class="token punctuation">)</span></mark><span class="token punctuation"></span> <span class="token punctuation">)</span> <span class="token punctuation">;</span>
<span class="token delimiter important">?></span>

직접 시도하십시오

유사한 함수
  • 배열에서 중복 값을 제거하십시오 array_unique

    array_unique

    배열에서중복값을제거하십시오
  • 콜백 함수를 사용하여 데이터를 비교하여 배열 차이 세트를 계산합니다. array_udiff

    array_udiff

    콜백함수를사용하여데이터를비교하여배열차
  • 하나 이상의 셀을 배열 끝으로 밀어 넣습니다 (스택까지) array_push

    array_push

    하나이상의셀을배열끝으로밀어넣습니다(스
  • 키 이름 비교를 사용하여 배열 차이 세트를 계산합니다. array_diff_key

    array_diff_key

    키이름비교를사용하여배열차이세트를계산합
  • 콜백 함수를 사용하여 배열에서 유닛을 필터링하십시오 array_filter

    array_filter

    콜백함수를사용하여배열에서유닛을필터링하
  • 배열에서 현재 요소를 반환합니다 current

    current

    배열에서현재요소를반환합니다
  • 키와 값을 배열로 바꾸십시오 array_flip

    array_flip

    키와값을배열로바꾸십시오
  • "천연 정렬"알고리즘을 사용하여 배열을 정렬합니다 natsort

    natsort

    "천연정렬"알고리즘
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