How to use data summary functions in PHP

With the development of the Internet, data processing has become every programmer's daily work. In PHP, we can use various data summary functions to easily calculate, filter and process data. This article will introduce some commonly used data summary functions in PHP and their usage.

1. Array-related functions

1. array_sum()

array_sum() function is used to calculate the sum of all elements in the array. For example:

$array = array(1, 2, 3, 4, 5);
$sum = array_sum($array);
echo $sum;
//输出: 15

2, array_count_values()

array_count_values() function is used to count the number of occurrences of each element in the array. For example:

$array = array('a', 'b', 'c', 'a', 'c', 'a');
$count = array_count_values($array);
print_r($count);
//输出: Array ( [a] => 3 [b] => 1 [c] => 2 )

3, array_unique()

array_unique() function is used to remove duplicate elements in the array. For example:

$array = array('a', 'b', 'c', 'a', 'c', 'a');
$unique = array_unique($array);
print_r($unique);
//输出: Array ( [0] => a [1] => b [2] => c )

2. Functions related to mathematical operations

1. abs()

abs() function is used to calculate the absolute value of a number. For example:

$num = -5;
$abs = abs($num);
echo $abs;
//输出: 5

2, round()

The round() function is used to round a number. For example:

$num = 3.14159;
$round = round($num);
echo $round;
//输出: 3

3, sqrt()

sqrt() function is used to calculate the square root of a number. For example:

$num = 16;
$sqrt = sqrt($num);
echo $sqrt;
//输出: 4

3. String-related functions

1. strlen()

strlen() function is used to calculate the length of a string. For example:

$str = 'Hello World';
$length = strlen($str);
echo $length;
//输出: 11

2, substr()

substr() function is used to intercept part of a string. For example:

$str = 'Hello World';
$sub = substr($str, 0, 5);
echo $sub;
//输出: Hello

3, strtolower()

strtolower() function is used to convert a string to lowercase. For example:

$str = 'Hello World';
$lower = strtolower($str);
echo $lower;
//输出: hello world

Summary

The above are some commonly used data summary functions in PHP and their usage. These functions can help us process and calculate data more easily. In actual programming, choosing appropriate functions according to specific needs can greatly improve programming efficiency and code quality.

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