The role of countif function in php

The COUNTIF function is used in PHP to count the number of cells that meet a specified condition. Its usage is as follows: Specify the range of cells to be counted. Specifies the expression used to determine the condition to count.

The role of the COUNTIF function

The COUNTIF function is used in PHP to calculate the conditions that meet the specified conditions in a certain area. number of cells. The syntax of this function is as follows:

<code class="php">COUNTIF(range, criteria)</code>

where:

• range is the range of cells to be counted
• criteria is an expression used to specify the condition to be counted

Usage:

The COUNTIF function can be used for many different purposes, such as:

• Calculate the number of cells that meet specific conditions
• Find the position of the first or last row that meets specific conditions
• Summarize the values ​​under the specified conditions

Example:

The following example demonstrates the use of the COUNTIF function:

<code class="php">$data = array(
    array('Name', 'Age'),
    array('John', 25),
    array('Mary', 30),
    array('Bob', 22),
    array('Alice', 28),
);

// 计算年龄为 25 岁的单元格数量
$count = COUNTIF($data, "25");
echo $count; // 输出：1</code>

Notes:

• The COUNTIF function is not case sensitive.
• If the criteria parameter is not a valid expression, the function will return an error.
• If the criteria parameter is an empty string, the function will count all cells.
• If the range parameter is empty, the function will return 0.

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