Which functions in the PHP library are used for data processing?

PHP function library provides a variety of data processing and operation functions, including: Array functions: merge arrays, find intersection, add/remove elements String functions: get length, replace substrings, remove blanks, split string data Type conversion functions: Convert variables to integers, floats, strings, booleans Date and time functions: Get timestamp, format time, format time according to Greenwich time

Data processing functions in the PHP function library

PHP provides a wide range of functions that can process and operate data. This article will introduce commonly used data processing functions in the PHP function library and demonstrate their usage through practical cases.

Array function

• array_merge(): Merge multiple arrays
• array_intersect(): Returns the intersection of two arrays
• array_push(): Adds elements to the end of the array
• array_shift(): Removes the beginning of the array element and returns the element

String function

• strlen(): Get the string length
• str_replace(): Replace the substring in the string
• trim(): Remove the blank characters at both ends of the string
• explode(): Split the string according to the delimiter

Data type conversion function

• intval(): Convert the variable to an integer
• floatval(): Convert the variable to a floating point number
• strval(): Convert the variable to String
• boolval(): Convert a variable to a Boolean value

Date and time functions

• time(): Get the current timestamp
• date(): Format the timestamp into a string
• strtotime (): Parse the string into a timestamp
• gmdate(): Format the time according to Greenwich Mean Time

Actual combat Case

Calculate the sum of array elements

$numbers = [1, 2, 3, 4, 5];
$total = array_sum($numbers);
echo $total; // 输出结果：15

Convert string to uppercase

$string = "hello world";
$uppercase = strtoupper($string);
echo $uppercase; // 输出结果：HELLO WORLD

Convert timestamp to date

$timestamp = 1647620465;
$date = date("Y-m-d H:i:s", $timestamp);
echo $date; // 输出结果：2022-03-22 11:01:05

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