Usage differences between the foreach loops in PHP and Java

1. The foreach statement describes:

①php:

The foreach syntax structure provides an easy way to iterate through an array. foreach can only be applied to arrays and objects, if you try to apply a variable to another data type, or an uninitialized variable will emit an error message.

②java:

The foreach statement is one of the new features of Java5, and foreach provides developers with great convenience in traversing arrays and collections.
The foreach statement is a special simplified version of the for statement, but the foreach statement does not completely replace the For statement, however, any foreach statement can be rewritten as a version of the for statement.
foreach is not a keyword, and it is customary to call this special for-statement format a "foreach" statement. To understand the meaning of foreach as "for each" from the literal meaning of English. That's actually what this means.

2. Syntax format

Statement format for foreach in ①php:

foreach (array or object name as $value) {

Statement

}
Or

foreach (array or object name as $key = = $value) {

Statement

}

Statement format for foreach in ②java:
for (element type T element variable x: Traverse object obj) {
A Java statement that references X;
}

3. code example:

foreach loops in the ①php

<?php $arr = Array ("1" = "Zhang San", "2" = "John Doe", "3" = "Harry"), and foreach ($arr as $key = = $value) {  echo $key. = ". $value." \ n ";}?" > results are as follows:1=> Zhang San 2=> John Doe 3=> Harry

foreach loops in the ②java

int arr[] = {2, 3, 1}; for (int x:arr) {System.out.println (x);//Output The value of the array element individually} output result: 231

　　

　　

Usage differences between the foreach loops in PHP and Java