How to set the value of drop-down box in php-PHP Knowledge-php.cn

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How to set the value of drop-down box in php

藏色散人

Dec 21, 2018 pm 03:46 PM

Use php to get the value of the drop-down box. We can do it through PHP foreach loop. The PHP foreach loop method can create or fill the HTML tag of the selection box, a piece of PHP code is defined, and then a PHP array variable is declared in it. Finally, the value of each option box is output through a foreach loop.

Tips: Files containing a mixture of HTML and PHP code can only parse the PHP code if they are saved in PHP format.

The effect is as follows:

How to set the value of drop-down box in php

Note: The

foreach syntax structure provides a simple way to traverse the array. foreach can only be applied to arrays and objects. If you try to apply it to variables of other data types, or uninitialized variables, an error message will be issued.

foreach has two syntaxes:

foreach (array_expression as $value)
    statement
foreach (array_expression as $key => $value)
    statement

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The first format iterates over the given array_expression array. Each time through the loop, the value of the current cell is assigned to $value and the pointer inside the array is moved forward one step (so the next cell will be obtained in the next loop).

The second format does the same thing, except that the key name of the current unit will also be assigned to the variable $key in each loop.

This article is an introduction to the method of setting the value of the drop-down box in PHP. It is very simple and easy to understand. I hope it will be helpful to friends in need!

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