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关于php的数组函数的使用和说明

首先,先把我用过的几个array的函数写出来
①.in_array
我自己的感悟:in_array的话,第一个参数是你想要查找的字符串或者数字,然后第二个是数组,是你然后如果你的第一个参数的值在这个数组里面的话,就返回ture,否则就返回false。

定义和用法:
in_array() 函数在数组中搜索给定的值

语法

<code class=" hljs ocaml">in_array(<span class="hljs-keyword">value</span>,<span class="hljs-built_in">array</span>,<span class="hljs-class"><span class="hljs-keyword">type</span>)</span></code>
参数 描述
value 必需。规定要在数组搜索的值。
array 必需。规定要搜索的数组。
type 可选。如果设置该参数为 true,则检查搜索的数据与数组的值的类型是否相同。

说明

如果给定的值 value 存在于数组 array 中则返回 true。如果第三个参数设置为 true,函数只有在元素存在于数组中且数据类型与给定值相同时才返回 true。

如果没有在数组中找到参数,函数返回 false。

注释:如果 value 参数是字符串,且 type 参数设置为 true,则搜索区分大小写。

例子 1

<code class=" hljs xml"><span class="php"><span class="hljs-preprocessor"><?php</span><span class="hljs-variable">$people</span> = <span class="hljs-keyword">array</span>(<span class="hljs-string">"Peter"</span>, <span class="hljs-string">"Joe"</span>, <span class="hljs-string">"Glenn"</span>, <span class="hljs-string">"Cleveland"</span>);<span class="hljs-keyword">if</span> (in_array(<span class="hljs-string">"Glenn"</span>,<span class="hljs-variable">$people</span>))  {  <span class="hljs-keyword">echo</span> <span class="hljs-string">"Match found"</span>;  }<span class="hljs-keyword">else</span>  {  <span class="hljs-keyword">echo</span> <span class="hljs-string">"Match not found"</span>;  }<span class="hljs-preprocessor">?></span></span></code>

输出:

<code class=" hljs lasso"><span class="hljs-keyword">Match</span> found</code>

例子 2

<code class=" hljs xml"><span class="php"><span class="hljs-preprocessor"><?php</span><span class="hljs-variable">$people</span> = <span class="hljs-keyword">array</span>(<span class="hljs-string">"Peter"</span>, <span class="hljs-string">"Joe"</span>, <span class="hljs-string">"Glenn"</span>, <span class="hljs-string">"Cleveland"</span>, <span class="hljs-number">23</span>);<span class="hljs-keyword">if</span> (in_array(<span class="hljs-string">"23"</span>,<span class="hljs-variable">$people</span>, <span class="hljs-keyword">TRUE</span>))  {  <span class="hljs-keyword">echo</span> <span class="hljs-string">"Match found<br />"</span>;  }<span class="hljs-keyword">else</span>  {  <span class="hljs-keyword">echo</span> <span class="hljs-string">"Match not found<br />"</span>;  }<span class="hljs-keyword">if</span> (in_array(<span class="hljs-string">"Glenn"</span>,<span class="hljs-variable">$people</span>, <span class="hljs-keyword">TRUE</span>))  {  <span class="hljs-keyword">echo</span> <span class="hljs-string">"Match found<br />"</span>;  }<span class="hljs-keyword">else</span>  {  <span class="hljs-keyword">echo</span> <span class="hljs-string">"Match not found<br />"</span>;  }<span class="hljs-keyword">if</span> (in_array(<span class="hljs-number">23</span>,<span class="hljs-variable">$people</span>, <span class="hljs-keyword">TRUE</span>))  {  <span class="hljs-keyword">echo</span> <span class="hljs-string">"Match found<br />"</span>;  }<span class="hljs-keyword">else</span>  {  <span class="hljs-keyword">echo</span> <span class="hljs-string">"Match not found<br />"</span>;  }<span class="hljs-preprocessor">?></span></span></code>

输出:

<code class=" hljs lasso"><span class="hljs-keyword">Match</span> <span class="hljs-literal">not</span> found<span class="hljs-keyword">Match</span> found<span class="hljs-keyword">Match</span> found</code>

② array_splice
我自己的看法,这个方法主要是在数组当中插入一个值到指定的位置

定义和用法:
array_splice() 函数与 array_slice() 函数类似,选择数组中的一系列元素,但不返回,而是删除它们并用其它值代替。

如果提供了第四个参数,则之前选中的那些元素将被第四个参数指定的数组取代。

最后生成的数组将会返回。

语法

<code class=" hljs php">array_splice(<span class="hljs-keyword">array</span>,offset,length,<span class="hljs-keyword">array</span>)</code>
参数 描述
array 必需。规定数组。
offset 必需。数值。如果 offset 为正,则从输入数组中该值指定的偏移量开始移除。如果 offset 为负,则从输入数组末尾倒数该值指定的偏移量开始移除。。
length 可选。数值。如果省略该参数,则移除数组中从 offset 到 结尾的所有部分。如果指定了 length 并且为正值,则移除这么多元素。如果指定了 length 且为负值,则移除从 offset 到数组末尾倒数 length 为止中间所有的元素。
array 被移除的元素由此数组中的元素替代。如果没有移除任何值,则此数组中的元素将插入到指定位置。

提示和注释

提示:如果函数没有删除任何元素 (length=0),则替代数组将从 start 参数的位置插入。(参见例子 3)

注释:不保留替代数组中的键。

例子 1

<code class=" hljs xml"><span class="php"><span class="hljs-preprocessor"><?php</span><span class="hljs-variable">$a1</span>=<span class="hljs-keyword">array</span>(<span class="hljs-number">0</span>=><span class="hljs-string">"Dog"</span>,<span class="hljs-number">1</span>=><span class="hljs-string">"Cat"</span>,<span class="hljs-number">2</span>=><span class="hljs-string">"Horse"</span>,<span class="hljs-number">3</span>=><span class="hljs-string">"Bird"</span>);<span class="hljs-variable">$a2</span>=<span class="hljs-keyword">array</span>(<span class="hljs-number">0</span>=><span class="hljs-string">"Tiger"</span>,<span class="hljs-number">1</span>=><span class="hljs-string">"Lion"</span>);array_splice(<span class="hljs-variable">$a1</span>,<span class="hljs-number">0</span>,<span class="hljs-number">2</span>,<span class="hljs-variable">$a2</span>);print_r(<span class="hljs-variable">$a1</span>);<span class="hljs-preprocessor">?></span></span></code>

输出:

<code class=" hljs php"><span class="hljs-keyword">Array</span> ( [<span class="hljs-number">0</span>] => Tiger [<span class="hljs-number">1</span>] => Lion [<span class="hljs-number">2</span>] => Horse [<span class="hljs-number">3</span>] => Bird )</code>

例子 2

<code class=" hljs xml"><span class="php"><span class="hljs-preprocessor"><?php</span><span class="hljs-variable">$a1</span>=<span class="hljs-keyword">array</span>(<span class="hljs-number">0</span>=><span class="hljs-string">"Dog"</span>,<span class="hljs-number">1</span>=><span class="hljs-string">"Cat"</span>,<span class="hljs-number">2</span>=><span class="hljs-string">"Horse"</span>,<span class="hljs-number">3</span>=><span class="hljs-string">"Bird"</span>);<span class="hljs-variable">$a2</span>=<span class="hljs-keyword">array</span>(<span class="hljs-number">0</span>=><span class="hljs-string">"Tiger"</span>,<span class="hljs-number">1</span>=><span class="hljs-string">"Lion"</span>);print_r(array_splice(<span class="hljs-variable">$a1</span>,<span class="hljs-number">0</span>,<span class="hljs-number">2</span>,<span class="hljs-variable">$a2</span>));<span class="hljs-preprocessor">?></span></span></code>

输出:

<code class=" hljs php"><span class="hljs-keyword">Array</span> ( [<span class="hljs-number">0</span>] => Dog [<span class="hljs-number">1</span>] => Cat )</code>

例子 3
length 参数设置为 0:

<code class=" hljs xml"><span class="php"><span class="hljs-preprocessor"><?php</span><span class="hljs-variable">$a1</span>=<span class="hljs-keyword">array</span>(<span class="hljs-number">0</span>=><span class="hljs-string">"Dog"</span>,<span class="hljs-number">1</span>=><span class="hljs-string">"Cat"</span>);<span class="hljs-variable">$a2</span>=<span class="hljs-keyword">array</span>(<span class="hljs-number">0</span>=><span class="hljs-string">"Tiger"</span>,<span class="hljs-number">1</span>=><span class="hljs-string">"Lion"</span>);array_splice(<span class="hljs-variable">$a1</span>,<span class="hljs-number">1</span>,<span class="hljs-number">0</span>,<span class="hljs-variable">$a2</span>);print_r(<span class="hljs-variable">$a1</span>);<span class="hljs-preprocessor">?></span></span></code>

输出:

<code class=" hljs php"><span class="hljs-keyword">Array</span> ( [<span class="hljs-number">0</span>] => Dog [<span class="hljs-number">1</span>] => Tiger [<span class="hljs-number">2</span>] => Lion [<span class="hljs-number">3</span>] => Cat )</code>

后续还会更新:array_unshift
array_push等

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