Maison >développement back-end >tutoriel php >经验之谈PHP数组函数总结_PHP教程
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。
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>$</span><span class="attribute"><font color="#ff0000">input_array</font></span><span>=array('a','b','c','d','e'); </span></span></li> <li class=""><span>print_r(array_chunk($input_array,2)); </span></li> </ol>
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()
<ol class="dp-xml"> <li class="alt"><span><span>functionodd($var){ </span></span></li> <li class=""> <span>return($var%</span><span class="attribute"><font color="#ff0000">2</font></span><span>==1); </span> </li> <li class="alt"><span>} </span></li> <li class=""><span>functioneven($var){ </span></li> <li class="alt"> <span>return($var%</span><span class="attribute"><font color="#ff0000">2</font></span><span>==0); </span> </li> <li class=""><span>} </span></li> <li class="alt"> <span>$</span><span class="attribute-value"><font color="#0000ff">array</font></span><span class="attribute"><font color="#ff0000">array1</font></span><span>=array("a"=</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>1,"b"=</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>2,"c"=</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>3,"d"=</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>4,"e"=</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>5); </span> </li> <li class=""> <span>$</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> </li> <li class="alt"><span>echo"Odd:n"; </span></li> <li class=""><span>print_r(array_filter($array1,"odd")); </span></li> <li class="alt"><span>echo"Even:n"; </span></li> <li class=""><span>print_r(array_filter($array2,"even")); </span></li> <li class="alt"> <span></span><span class="tag"><strong><font color="#006699">?></font></strong></span><span> </span> </li> </ol>
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> <li class=""><span>functioncube($n){ </span></li> <li class="alt"><span>return$n*$n*$n; </span></li> <li class=""><span>} </span></li> <li class="alt"><span> </span></li> <li class=""> <span>$</span><span class="attribute">a</span><span>=</span><span class="attribute-value">array</span><span>(1,2,3,4,5); </span> </li> <li class="alt"> <span>$</span><span class="attribute">b</span><span>=</span><span class="attribute-value">array_map</span><span>("cube",$a); </span> </li> <li class=""><span>print_r($b); </span></li> <li class="alt"> <span></span><span class="tag">?></span><span> </span> </li> <li class=""><span> </span></li> <li class="alt"><span>//多个数组参数的例子 </span></li> <li class=""><span>functionshow_Spanish($n,$m){ </span></li> <li class="alt"><span>return"Thenumber$niscalled$minSpanish"; </span></li> <li class=""><span>} </span></li> <li class="alt"><span> </span></li> <li class=""><span>functionmap_Spanish($n,$m){ </span></li> <li class="alt"> <span>returnarray($</span><span class="attribute">n</span><span>=</span><span class="tag">></span><span>$m); </span> </li> <li class=""><span>} </span></li> <li class="alt"><span> </span></li> <li class=""> <span>$</span><span class="attribute">a</span><span>=</span><span class="attribute-value">array</span><span>(1,2,3,4,5); </span> </li> <li class="alt"> <span>$</span><span class="attribute">b</span><span>=</span><span class="attribute-value">array</span><span>("uno","dos","tres","cuatro","cinco"); </span> </li> <li class=""><span> </span></li> <li class="alt"> <span>$</span><span class="attribute">c</span><span>=</span><span class="attribute-value">array_map</span><span>("show_Spanish",$a,$b); </span> </li> <li class=""><span>print_r($c); </span></li> <li class="alt"> <span>$</span><span class="attribute">d</span><span>=</span><span class="attribute-value">array_map</span><span>("map_Spanish",$a,$b); </span> </li> <li class=""><span>print_r($d); </span></li> <li class="alt"> <span></span><span class="tag">?></span><span> </span> </li> <li class=""><span>//输出结果 </span></li> <li class="alt"><span>//printoutof$c </span></li> <li class=""><span>Array </span></li> <li class="alt"><span>( </span></li> <li class=""> <span>[0]=</span><span class="tag">></span><span>Thenumber1iscalledunoinSpanish </span> </li> <li class="alt"> <span>[1]=</span><span class="tag">></span><span>Thenumber2iscalleddosinSpanish </span> </li> <li class=""> <span>[2]=</span><span class="tag">></span><span>Thenumber3iscalledtresinSpanish </span> </li> <li class="alt"> <span>[3]=</span><span class="tag">></span><span>Thenumber4iscalledcuatroinSpanish </span> </li> <li class=""> <span>[4]=</span><span class="tag">></span><span>Thenumber5iscalledcincoinSpanish </span> </li> <li class="alt"><span>) </span></li> </ol>
以上就是有关PHP数组函数的相关总结,大家要熟记啊。