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Most people don't understand the knowledge points of this article "how to print only array subscripts in php", so Xiaobian summarizes the following contents for everyone. The contents are detailed, the steps are clear, and they have certain reference value. I hope everyone can gain something after reading this article. Let's take a look at this article "how to print only array subscripts in php".

In php, you can loop through arrays and print array subscripts using foreach and echo statements, syntax "foreach($array as $key => $value){echo $key. "

";}"。

Operating environment of this tutorial: Windows 7 system, PHP7.1 version, DELL G3 computer

How does PHP print array subscripts only?

Implementation:

Traversing an array with foreach statements;

In a loop, print array subscripts using the echo statement.

Implementation code:

Description:

foreach is a statement designed specifically for traversing arrays. It is a commonly used method for traversing arrays. It provides great convenience in traversing arrays; after PHP5, you can also traverse objects (foreach can only be applied to arrays and objects).

The foreach statement has two syntax formats:

Syntax Format 1:

foreach ($array as $value){ statement block;}

Travels over a given $array, assigning the value of the current array to $value in each loop.

Syntax Format 2:

foreach ($array as $key => $value){ statement block;}

Traversing through a given $array assigns the value of the current array to $value and the key to $key in each loop.

foreach statement In each loop, the pointer inside the array advances one step, so that in the next loop you get the next array element, until you reach the end of the array, stop iterating and exit the loop.

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