经验之谈PHP数组函数总结_PHP教程-php教程-PHP中文网

经验之谈PHP数组函数总结_PHP教程

php中文网

发布： 2016-07-15 13:27:15

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这几天在网上看了很多有关php数组函数的相关知识，觉得孔老夫子的“温故而知新”果然不假，这里是我总结的一些经验，希望对大家有帮助。

PHP中的数组实际上是一个有序图，图是一种把values映射到keys的类型。此类型在很多方面做了优化，因此你可以把它当成真正的数组来使用，或列表（矢量），散列表（是图的一种实现），字典，集合，栈，队列以及更多可能性。因为可以用另一个PHP数组作为值，也可以很容易地模拟树。解释这些结构超出了本手册的范围，但对于每种结构你至少会发现一个例子。要得到这些结构的更多信息，我们建议你参考有关此广阔主题的外部著作，以下特记下我的一些PHP数组函数体会：

1.将一个1维数组分割成2维数组array_chunk()

<OL class=dp-xml><LI class=alt><SPAN><SPAN>$</SPAN><SPAN class=attribute><FONT color=#ff0000>input_array</FONT></SPAN><SPAN>=array('a','b','c','d','e');  </SPAN></SPAN><LI class=""><SPAN>print_r(array_chunk($input_array,2)); </SPAN></LI></OL>

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2.比较2个数组，array_diff_assoc（）或者array_diff（），如果返回值为空，表示两个数组相同，否则就不同。

3.用一个函数来过滤数组中的数值array_filter()

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<OL class=dp-xml><LI class=alt><SPAN><SPAN>functionodd($var){  </SPAN></SPAN><LI class=""><SPAN>return($var%</SPAN><SPAN class=attribute><FONT color=#ff0000>2</FONT></SPAN><SPAN>==1);  </SPAN></SPAN><LI class=alt><SPAN>}  </SPAN><LI class=""><SPAN>functioneven($var){  </SPAN><LI class=alt><SPAN>return($var%</SPAN><SPAN class=attribute><FONT color=#ff0000>2</FONT></SPAN><SPAN>==0);  </SPAN></SPAN><LI class=""><SPAN>}  </SPAN><LI class=alt><SPAN>$</SPAN><SPAN class=attribute-value><FONT color=#0000ff>array</FONT></SPAN><SPAN class=attribute><FONT color=#ff0000>array1</FONT></SPAN><SPAN>=array("a"=</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></FONT></STRONG></SPAN><SPAN>1,"b"=</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></FONT></STRONG></SPAN><SPAN>2,"c"=</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></FONT></STRONG></SPAN><SPAN>3,"d"=</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></FONT></STRONG></SPAN><SPAN>4,"e"=</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></FONT></STRONG></SPAN><SPAN>5);  </SPAN></SPAN><LI class=""><SPAN>$</SPAN><SPAN class=attribute-value><FONT color=#0000ff>array</FONT></SPAN><SPAN class=attribute><FONT color=#ff0000>array2</FONT></SPAN><SPAN>=array(6,7,8,9,10,11,12);  </SPAN></SPAN><LI class=alt><SPAN>echo"Odd:n";  </SPAN><LI class=""><SPAN>print_r(array_filter($array1,"odd"));  </SPAN><LI class=alt><SPAN>echo"Even:n";  </SPAN><LI class=""><SPAN>print_r(array_filter($array2,"even"));  </SPAN><LI class=alt><SPAN></SPAN><SPAN class=tag><STRONG><FONT color=#006699>?></FONT></STRONG></SPAN><SPAN> </SPAN></SPAN></LI></OL>

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4.array_map()将回调函数作用到给定数组的单元上，它的参数可以是一个数组，也可以是多个数组，回调函数的参数必须要和调用它的参数相同。

<OL class=dp-xml><LI class=alt><SPAN><SPAN>//单个参数的例子，将数组中的每个值，乘以它的3次方  </SPAN></SPAN><LI class=""><SPAN>functioncube($n){  </SPAN><LI class=alt><SPAN>return$n*$n*$n;  </SPAN><LI class=""><SPAN>}  </SPAN><LI class=alt><SPAN> </SPAN><LI class=""><SPAN>$</SPAN><SPAN class=attribute>a</SPAN><SPAN>=</SPAN><SPAN class=attribute-value>array</SPAN><SPAN>(1,2,3,4,5);  </SPAN></SPAN><LI class=alt><SPAN>$</SPAN><SPAN class=attribute>b</SPAN><SPAN>=</SPAN><SPAN class=attribute-value>array_map</SPAN><SPAN>("cube",$a);  </SPAN></SPAN><LI class=""><SPAN>print_r($b);  </SPAN><LI class=alt><SPAN></SPAN><SPAN class=tag>?></SPAN><SPAN> </SPAN></SPAN><LI class=""><SPAN> </SPAN><LI class=alt><SPAN>//多个数组参数的例子  </SPAN><LI class=""><SPAN>functionshow_Spanish($n,$m){  </SPAN><LI class=alt><SPAN>return"Thenumber$niscalled$minSpanish";  </SPAN><LI class=""><SPAN>}  </SPAN><LI class=alt><SPAN> </SPAN><LI class=""><SPAN>functionmap_Spanish($n,$m){  </SPAN><LI class=alt><SPAN>returnarray($</SPAN><SPAN class=attribute>n</SPAN><SPAN>=</SPAN><SPAN class=tag>></SPAN><SPAN>$m);  </SPAN></SPAN><LI class=""><SPAN>}  </SPAN><LI class=alt><SPAN> </SPAN><LI class=""><SPAN>$</SPAN><SPAN class=attribute>a</SPAN><SPAN>=</SPAN><SPAN class=attribute-value>array</SPAN><SPAN>(1,2,3,4,5);  </SPAN></SPAN><LI class=alt><SPAN>$</SPAN><SPAN class=attribute>b</SPAN><SPAN>=</SPAN><SPAN class=attribute-value>array</SPAN><SPAN>("uno","dos","tres","cuatro","cinco");  </SPAN></SPAN><LI class=""><SPAN> </SPAN><LI class=alt><SPAN>$</SPAN><SPAN class=attribute>c</SPAN><SPAN>=</SPAN><SPAN class=attribute-value>array_map</SPAN><SPAN>("show_Spanish",$a,$b);  </SPAN></SPAN><LI class=""><SPAN>print_r($c);  </SPAN><LI class=alt><SPAN>$</SPAN><SPAN class=attribute>d</SPAN><SPAN>=</SPAN><SPAN class=attribute-value>array_map</SPAN><SPAN>("map_Spanish",$a,$b);  </SPAN></SPAN><LI class=""><SPAN>print_r($d);  </SPAN><LI class=alt><SPAN></SPAN><SPAN class=tag>?></SPAN><SPAN> </SPAN></SPAN><LI class=""><SPAN>//输出结果  </SPAN><LI class=alt><SPAN>//printoutof$c  </SPAN><LI class=""><SPAN>Array  </SPAN><LI class=alt><SPAN>(  </SPAN><LI class=""><SPAN>[0]=</SPAN><SPAN class=tag>></SPAN><SPAN>Thenumber1iscalledunoinSpanish  </SPAN></SPAN><LI class=alt><SPAN>[1]=</SPAN><SPAN class=tag>></SPAN><SPAN>Thenumber2iscalleddosinSpanish  </SPAN></SPAN><LI class=""><SPAN>[2]=</SPAN><SPAN class=tag>></SPAN><SPAN>Thenumber3iscalledtresinSpanish  </SPAN></SPAN><LI class=alt><SPAN>[3]=</SPAN><SPAN class=tag>></SPAN><SPAN>Thenumber4iscalledcuatroinSpanish  </SPAN></SPAN><LI class=""><SPAN>[4]=</SPAN><SPAN class=tag>></SPAN><SPAN>Thenumber5iscalledcincoinSpanish  </SPAN></SPAN><LI class=alt><SPAN>)  </SPAN></LI></OL>

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以上就是有关PHP数组函数的相关总结，大家要熟记啊。