Summary of array processing function examples in PHP
The examples in this article summarize the array processing functions in PHP. Share it with everyone for your reference, the details are as follows:
<?php //改变数组键的大小写 $arr1=array("a"=>"Lamp","db"=>"database","LANGUAGE"=>"PHP"); print_r(array_change_key_case($arr1,CASE_UPPER)); echo "<br/>"; print_r(array_change_key_case($arr1,CASE_LOWER)); echo "<hr><br/>"; //将一个数组分割成多个 第三个参数设定是否保留键 $arr2=array('a','b','c','d','e','f','g'); print_r(array_chunk($arr2,2,true)); echo "<br/>"; print_r(array_chunk($arr2,2,false)); echo "<hr><br/>"; //array array_diff_assoc ( array $array1 , array $array2 [, array $ ... ] ) 返回一个数组, //该数组包括了所有在 array1 中但是不在任何其它参数数组中的值 //键不同也算 $arr3=array('a'=>'green','b'=>'brown','c'=>'red'); $arr4=array('a'=>'green','yellow','red'); print_r(array_diff_assoc($arr3,$arr4)); echo "<hr><br/>"; //array_diff ( array $array1 , array $array2 [, array $ ... ] ) //返回一个数组,该数组包括了所有在 array1 中但是不在任何 //其它参数数组中的值,键不同不算 print_r(array_diff($arr3,$arr4)); echo "<hr><br>"; //array_fill ( int $start_index , int $num , mixed $value ) //用 value参数的值将一个数组填充 num 个条目, //键名由 start_index 参数指定的开始。 print_r(array_fill(-5,8,"banana")); echo "<hr><br/>"; //array_flip ( array $trans ) //返回一个反转后的 array,例如 trans 中的键名变成了值, //而 trans 中的值成了键名。 $arr5=array('a'=>'1',"b"=>"2","c","d","e"); print_r(array_flip($arr5)); echo "<hr><br/>"; //array_map ( callback $callback , array $arr1 [, array $... ] ) //返回一个数组,该数组包含了 arr1 中的所有单元经过 callback 作用过 //之后的单元。callback接受的参数数目应该和传递给 array_map() //函数的数组数目一致。 function cube($n){ return $n*$n; } $arr6=array(1,2,3,4,5); print_r(array_map("cube",$arr6)); echo "<hr><br/>"; //array_merge_recursive ( array $array1 [, array $... ] ) //将一个或多个数组的单元合并起来,一个数组中的值附加在前一个数组 //的后面。返回作为结果的数组。如果输入的数组中有相同的字符串键名, //则这些值会被合并到一个数组中去,这将递归下去,因此如果一个值本身 //是一个数组,本函数将按照相应的条目把它合并为另一个数组。然而,如 //果数组具有相同的数组键名,后一个值将不会覆盖原来的值,而是附加到 //后面。 $arr7=array("color"=>array("favorite"=>"red"),5); $arr8=array(10,array("favorite"=>"yellow","blue")); print_r(array_merge_recursive($arr7,$arr8)); echo "<hr><br/>"; //array_reduce ( array $input , callback $function [, int $initial ] //将回调函数 function 迭代地作用到 input 数组中的每一个单元中,从而将数组 //简化为单一的值。如果指定了可选参数 initial,该参数将被当成是数组中的第 //一个值来处理,或者如果数组为空的话就作为最终返回值。如果数组为空并且没 //有传递 initial 参数,array_reduce() 返回 NULL。 function rsum($v,$w){ $v+=$w; return $v; } function rmul($v,$w){ $v*=$w; return $v; } $a=array(1,2,3,4,5); $x=array(); $b=array_reduce($a,"rsum"); $c=array_reduce($a,"rmul",10); $d=array_reduce($x,"rsum",1); echo $b."\t\t".$c."\t\t".$d."\n"; echo "<hr><br/>"; //array_replace ( array &$array , array &$array1 [, array &$array2 [, array &$... ]] ) //函数使用后面数组元素的值替换第一个 array 数组的值。如果一个键存在于第一 //个数组同时也存在于第二个数组,它的值将被第二个数组中的值替换。如果一个 //键存在于第二个数组,但是不存在于第一个数组,则会在第一个数组中创建这个 //元素。如果一个键仅存在于第一个数组,它将保持不变。如果传递了多个替换数 //组,它们将被按顺序依次处理,后面的数组将覆盖之前的值。 $base=array("orange","banana","apple","raspberry"); $replacements=array(0=>"pineapple",4=>"cherry"); $replacements2=array(0=>"grape"); //print_r(array_replace($base,$replacements,$replacements2)); //echo "<hr><br/>"; //array_splice ( array &$input , int $offset [, int $length [, array $ replacement ]] ) //把 input 数组中由 offset 和 length指定的单元去掉,如果提供了 replacement // 参数,则用 replacement数组中的单元取代。返回一个包含有被移除单元的数组 // 。注意 input 中的数字键名不被保留。如果省略 length,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,则移除这么多单元 // 。如果指定了 length并且为负值,则移除从 offset 到数组末尾倒数 length // 为止中间所有的单元。小窍门:当给出了 replacement 时要移除从 offset到 // 数组末尾所有单元时,用 count($input) 作为 length。 $input=array("red","green","blue","yellow"); array_splice($input,1,-1); print_r($input); echo "<hr><br/>"; //key ( array &$array ) //返回数组中当前单元的键名。 $fruit=array("fruit1"=>"apple","fruit2"=>"orange","fruit3"=>"grape", "fruit4"=>"apple","fruit5"=>"apple"); while($fruit_name=current($fruit)){ if($fruit_name=='apple'){ echo key($fruit)."<br/>"; } next($fruit); } echo "<hr><br/>"; ?>
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