How to write the total code of xml

The sum() function in XML is used to sum up numbers. Its syntax is: sum(expression), where expression is a collection of numeric expressions that require sum. For example, to total the number of all items in an order, you can use the XPath expression: sum(//item/@quantity).

XML Total Code

In XML (Extensible Markup Language) sum() function is used to sum up numbers.

grammar:

 <code class="xml">sum(expression)</code>

in:

• expression : a collection of numeric expressions that require sum.

Example:

The following XML code snippet totals the number of all items in the order:

 <code class="xml"><orders> <order> <item quantity="1"></item> <item quantity="2"></item> <item quantity="3"></item> </order> <order> <item quantity="4"></item> <item quantity="5"></item> <item quantity="6"></item> </order> </orders></code>

To get order totals, you can use the following XPath expression:

 <code class="xml">sum(//item/@quantity)</code>

The result is:

 <code>21</code>

Other notes:

• sum() function is only suitable for numeric expressions.
• If the expression contains a non-numeric value, the value will be ignored.
• sum() function can accept multiple expressions as parameters, separated by commas.
• If the result of all expressions is 0 , the result of sum() function is also 0 .

The above is the detailed content of How to write the total code of xml. For more information, please follow other related articles on the PHP Chinese website!