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In this article, we talk about the use and differences between the For loop and the Foreach Loop in PHP, and I believe many of you may not be aware of the difference between the for loop and the Foreach loop, so let's talk about it in detail today!
This article mainly introduces the knowledge about the For loop and the Foreach loop in C #, which has a good reference value. Let's take a look at it. For loops and foreach loops can actually be subordinate, that is, the Foreach loop can be
ForeachPhp Tutorial 4 (not php 3) includes the foreach structure, which is similar to perl and other languages. This is just a simple way to traverse arrays. Foreach can only be used for arrays. An error occurs when you try to use it for another
Differences between php loop statements for () and foreach. A for loop is the most complex loop structure in PHP. Its behavior is similar to that in C. The syntax of the for loop is: for (expr1; expr2; expr3) statement the first expression (expr1)
The For loop is the most complex loop structure in PHP. Its behavior is similar to the C language. The syntax for the For loop is:
for (EXPR1; expr2; expr3) statement
The first expression (EXPR1) is evaluated unconditionally before the start of the
The For loop is the most complex loop structure in PHP. Its behavior is similar to the C language. The syntax for the For loop is:
for (EXPR1; expr2; expr3) statement
The first expression (EXPR1) is evaluated unconditionally before the start of
The code is as follows:
$a = [1, 2, 3];foreach($a as $key => &$value) { $value = 5;}var_dump($a);
The final output results are as follows:
array(3) { [0]=> int(5) [1]=> int(5) [2]=> &int(5) }
Question: Why do I get an address character before
The For loop is the most complex loop structure in PHP. Its behavior is similar to the C language. The syntax for the For loop is:
for (EXPR1; expr2; expr3) statement
The first expression (EXPR1) is evaluated unconditionally once before the loop
The foreach basic syntax is as follows:
FOREACH ($array _variable as $value)
{
[Code to execute]
}
Or
FOREACH ($array _variable as $key => $value)
{
[Code to execute]
}
In both cases, multiple [code executions] will be executed equal to the number
Next, I will use two instances to introduce the differences between foreach and for statements in php. if you need them, refer to the for loop, which is the most complex loop structure in PHP. Its behavior is similar to that of C language. The
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