PHP array call by value and call by address

public class ArrayTest {
public static void main(String[] args){
Map[] maparray=new Map[3];
for (int i = 0; i < maparray.length; i++) {
Map<String,String> map=new HashMap<String,String>();
map.put("a", i+"_ajkcz");
map.put("c", "werq_"+i);
maparray[i]=map;
}
System.out.println("++++++++++++++++++++++++");
for (int i = 0; i < maparray.length; i++) {
Map<String,String> map=maparray[i];
Iterator it=map.keySet().iterator();
while(it.hasNext()){
String key=(String) it.next(); 
System.out.println(key+"\t"+map.get(key) );
}
}
System.out.println("++++++++++++++++++++++++");
new ArrayCharge().printAndChangeArray(maparray);
System.out.println("++++++++++++++++++++++++");
for (int i = 0; i < maparray.length; i++) {
Map<String,String> map=maparray[i];
Iterator it=map.keySet().iterator();
while(it.hasNext()){
String key=(String) it.next(); 
System.out.println(key+"\t"+map.get(key) );
}
}
}
}
class ArrayCharge {
public void printAndChangeArray(Map[] maparray){
for (int i = 0; i < maparray.length; i++) {
Map<String,String> map=maparray[i];
map.put("a",i+"________");
}
for (int i = 0; i < maparray.length; i++) {
Map<String,String> map=maparray[i];
Iterator it=map.keySet().iterator();
while(it.hasNext()){
String key=(String) it.next(); 
System.out.println(key+"\t"+map.get(key) );
}
}
}
}
控制台输出结果：
++++++++++++++++++++++++
cwerq_0
a0_ajkcz
cwerq_1
a1_ajkcz
cwerq_2
a2_ajkcz
++++++++++++++++++++++++
cwerq_0
a0________
cwerq_1
a1________
cwerq_2
a2________
++++++++++++++++++++++++
cwerq_0
a0________
cwerq_1
a1________
cwerq_2
a2________

<?php 
$arraytest=array();
for($i=0;$i<3;$i++){
$child=array();
$child[&#39;keystr&#39;]=&#39;key&#39;.$i;
$child[&#39;valuestr&#39;]=&#39;value&#39;.$i;
$arraytest[]=$child;
}
print_r($arraytest);
print_r("+++++++++++++++++++++++++");
for($i=0;$i<count($arraytest);$i++){
$child=$arraytest[$i];
$child[&#39;valuestr&#39;]="_________".$i;
}
print_r($arraytest);
print_r("+++++++++++++++++++++++++");
?>

Array (
 [0] => Array (
            [keystr] => key0
            [valuestr] => value0
 )
 [1] => Array (
 [keystr] => key1
 [valuestr] => value1
 )
 [2] => Array ( 
[keystr] => key2
 [valuestr] => value2 
)
 )
 +++++++++++++++++++++++++
Array (
 [0] => Array ( 
[keystr] => key0
 [valuestr] => value0 
) 
[1] => Array (
 [keystr] => key1 
[valuestr] => value1
 ) 
[2] => Array ( 
[keystr] => key2 
[valuestr] => value2
 ) 
) +++++++++++++++++++++++++

<?php 
$arraytest=array();
for($i=0;$i<3;$i++){
$child=array();
$child[&#39;keystr&#39;]=&#39;key&#39;.$i;
$child[&#39;valuestr&#39;]=&#39;value&#39;.$i;
$arraytest[]=$child;
}
print_r($arraytest);
print_r("+++++++++++++++++++++++++");
for($i=0;$i<count($arraytest);$i++){
$child=&$arraytest[$i]; //注意这里加了一个指针符号，代表是传址调用
$child[&#39;valuestr&#39;]="_________".$i;
}
print_r($arraytest);
print_r("+++++++++++++++++++++++++");
?>

Array (
 [0] => Array (
 [keystr] => key0 
[valuestr] => value0 
)
 [1] => Array (
 [keystr] => key1 
[valuestr] => value1 
) 
[2] => Array ( 
[keystr] => key2 
[valuestr] => value2 
) 
)
 +++++++++++++++++++++++++
Array ( 
[0] => Array ( 
[keystr] => key0 
[valuestr] => _________0 
)
 [1] => Array ( 
[keystr] => key1 
[valuestr] => _________1 
)
 [2] => Array ( 
[keystr] => key2 
[valuestr] => _________2 
) 
)