PHP学习笔记之数组操作//待完善V10-php教程-PHP中文网

PHP学习笔记之数组操作//待完善V10

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发布： 2016-07-29 09:03:00

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1、array_map(callable, array)

1.1 将数组中value按照callable中原则进行逐一转换

代码：

<code><span>$result</span> = array_map(<span><span>function</span><span>(<span>$var</span>)</span>{</span><span>return</span> strtolower(<span>$var</span>);
        }, [<span>'PHP'</span>, <span>'LARAVEL'</span>, <span>'SYMFONY'</span>]);</code>

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结果：

立即学习“PHP免费学习笔记（深入）”；

<code><span>array</span>:<span>3</span> [▼
  <span>0</span> => <span>"php"</span><span>1</span> => <span>"laravel"</span><span>2</span> => <span>"symfony"</span>
]</code>

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类比JS中Array.prototype.map()：
代码：

<code>[<span>'PHP'</span>, <span>'LARAVEL'</span>, <span>'SYMFONY'</span>].map(<span><span>function</span><span>(str)</span>{</span><span>return</span> str.toLowerCase()});</code>

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结果：

立即学习“PHP免费学习笔记（深入）”；

<code>[<span>"php"</span>, <span>"laravel"</span>, <span>"symfony"</span>]</code>

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1.2 将几个数组按照每一个value合并为一个数组
代码：

<code><span>$arr1</span>    = [<span>'php'</span>, <span>'js'</span>, <span>'laravel'</span>];
<span>$arr2</span>    = [<span>'array_map'</span>, <span>'map'</span>, <span>'array_map'</span>];
<span>$result1</span> = array_map(<span>null</span>, <span>$arr1</span>, <span>$arr2</span>);</code>

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结果：

立即学习“PHP免费学习笔记（深入）”；

<code><span>array</span>:<span>3</span> [▼
  <span>0</span> => <span>array</span>:<span>2</span> [▼
    <span>0</span> => <span>"php"</span><span>1</span> => <span>"array_map"</span>
  ]
  <span>1</span> => <span>array</span>:<span>2</span> [▼
    <span>0</span> => <span>"js"</span><span>1</span> => <span>"map"</span>
  ]
  <span>2</span> => <span>array</span>:<span>2</span> [▼
    <span>0</span> => <span>"laravel"</span><span>1</span> => <span>"array_map"</span>
  ]
]</code>

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2、array_unique(array)

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可对数组value去重
代码：

<code><span>$arr_unique1</span> = [<span>'php'</span>, <span>'laravel'</span>, <span>'js'</span>, <span>'js'</span>, <span>'laravel'</span>];
<span>$arr_unique2</span> = [<span>4</span>, <span>'4'</span>, <span>5</span>, <span>'5'</span>, <span>6</span>, <span>5</span>, <span>'6'</span>, <span>'7'</span>];
array_unique(<span>$arr_unique1</span>);
array_unique(<span>$arr_unique2</span>);</code>

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结果：

立即学习“PHP免费学习笔记（深入）”；

<code><span>array</span>:<span>3</span> [▼
  <span>0</span> => <span>"php"</span><span>1</span> => <span>"laravel"</span><span>2</span> => <span>"js"</span>
]
<span>array</span>:<span>4</span> [▼
  <span>0</span> => <span>4</span><span>2</span> => <span>5</span><span>4</span> => <span>6</span><span>7</span> => <span>"7"</span>
]</code>

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3、array_flip(array)

将数组key和value相互转换
代码：

<code><span>$arr_flip</span> = [<span>'php'</span>=><span>'php'</span>,<span>'laravel'</span>=><span>'laravel'</span>, <span>'symfony'</span>];
array_flip(<span>$arr_flip</span>);</code>

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结果：

立即学习“PHP免费学习笔记（深入）”；

<code><span>array</span>:<span>3</span> [▼
  <span>"php"</span> => <span>"php"</span><span>"laravel"</span> => <span>"laravel"</span><span>"symfony"</span> => <span>0</span>
]</code>

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可利用这个函数对数组的value去重：

<code><span>$arr_flip</span> = [<span>'php'</span>=><span>'php'</span>,<span>'laravel'</span>=><span>'laravel'</span>, <span>'symfony'</span>, <span>'php'</span>];
array_flip(array_flip(<span>$arr_flip</span>));</code>

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结果：

立即学习“PHP免费学习笔记（深入）”；

<code><span>array</span>:<span>3</span> [▼
  <span>1</span> => <span>"php"</span><span>"laravel"</span> => <span>"laravel"</span><span>0</span> => <span>"symfony"</span>
]</code>

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以上就介绍了PHP学习笔记之数组操作//待完善V10，包括了方面的内容，希望对PHP教程有兴趣的朋友有所帮助。