php常用数组array函数实例总结【赋值,拆分,合并,计算,添加,删除

arsort

功能：逆向排序，索引不变

<?php
$fruits = array(
 "a"=>"lemon",
 "b"=>"orange",
 "c"=>"banana",
 "d"=>"apple",
 );
arsort($fruits);//按照字符逆向排序或数字
foreach($fruits as $key=>$val){
 echo "$key = $val<br>";
}
/**结果
b = orange
a = lemon
c = banana
d = apple
*/

asort

功能：进行正向排序

<?php
$fruits = array(
 "a"=>"lemon",
 "b"=>"orange",
 "c"=>"banana",
 "d"=>"apple",
 );
arsort($fruits);//按照字符逆向排序或数字
foreach($fruits as $key=>$val){
 echo "$key = $val<br>";
}
echo "<p>";
asort($fruits);//按照字符正向排序或数字
foreach($fruits as $key=>$val){
 echo "$key = $val<br>";
}
/**结果
b = orange
a = lemon
c = banana
d = apple
d = apple
c = banana
a = lemon
b = orange
*/

krsort

功能：按照键名进行逆向排序

<?php
$fruits = array(
 "a"=>"lemon",
 "b"=>"orange",
 "c"=>"banana",
 "d"=>"apple",
 );
krsort($fruits);//按照键名逆向排序或数字
foreach($fruits as $key=>$val){
 echo "$key = $val<br>";
}
/**结果
d = apple
c = banana
b = orange
a = lemon
*/

ksort

功能：按照键名进行正向排序

<?php
$fruits = array(
 "a"=>"lemon",
 "b"=>"orange",
 "c"=>"banana",
 "d"=>"apple",
 );
ksort($fruits);//按照键名正向排序或数字
foreach($fruits as $key=>$val){
 echo "$key = $val<br>";
}
/**结果
a = lemon
b = orange
c = banana
d = apple
*/

rsort

功能：按照值进行逆向排序，键名改变

<?php
$fruits = array(
 "a"=>"lemon",
 "b"=>"orange",
 "c"=>"banana",
 "d"=>"apple",
 );
rsort($fruits);//按照值进行逆向排序或数字，键名改变
foreach($fruits as $key=>$val){
 echo "$key = $val<br>";
}
/**结果
0 = orange
1 = lemon
2 = banana
3 = apple
*/

sort

功能：按照值进行正向排序，键名改变

<?php
$fruits = array(
 "a"=>"lemon",
 "b"=>"orange",
 "c"=>"banana",
 "d"=>"apple",
 );
sort($fruits);//按照值进行逆向排序或数字，键名改变
foreach($fruits as $key=>$val){
 echo "$key = $val<br>";
}
/**结果
0 = apple
1 = banana
2 = lemon
3 = orange
*/

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