[PHP] Practical functions 5_PHP tutorial
//Convert the binary representation of a number into hexadecimal
string bin2hex(string tring)
//Remove the spaces at the end of the string
string rtrim(string string )
//An alias for rtrim
string chop(string string)
//Remove spaces from both ends of the string
string trim(string string)
// Remove spaces from the beginning of the string
string ltrim(string string)
//Use string separator to split the string string and return the components of the string string in the array
array explode(string separator,string string)
//By adding glue string between each element of array pieces, combine the elements and return a string
string implode(string glue,array pieces)
//Makes a string uppercase
string strtoupper(string string)
//Makes a string lowercase
string strtolower(string string)
//Convert the same strings in strings str and from into strings in to one by one and return
string strtr(string str,string from,string to)
//Find the position of the first occurrence (case-insensitive) of a character in one string in another string
int strpos(string haystack,string needle,int [offset])
//Find the last position where the character in the string appears in another string. It is worth noting that needle can only be one character.
Chinese characters are not suitable for
int strrpos(string haystack,char needle)
//Change the string into small segments for use by other functions. For example, base64_encode. The default is that the parameter chunklen (76 characters) inserts end(" ") every
76 characters. Returns a new string without modifying the original string.
string chunck_split(string string,int[chunklen],string[end])
//Extract length characters from the start position of string string. If start is a negative number, it starts from the end of the string
. If the omitted parameter length exists but is a negative number, it means that the penultimate length character is obtained
string substr(string string,int start,int[length])
//returned string The following characters are preceded by a backslash (): .+*?[^]($)
string quotemeta(string str)
//Returns the ASCII (American National Standard) of the string exchange code) ordinal value. This function is opposite to the chr() function
int ord(string string)
//Convert the ASCII code into a character
string chr(int ascii)
//Use Capitalize the first character of a string
string ucfirst(string str)
//Capitalize the first character of each word in a string
string ucwords(string str)
//Compare the similarity between two characters and return the number of identical character sequences (chars) in the two strings. By using the reference variable given by
in the third parameter, pass the percentage of similar characters to The third parameter
int similar_text(string first,string second,double[percent]
//Convert single quotes, double quotes and backslash characters in a character with backslashes Definition
string addslashes(string str)
//Remove backslashes from the string
string stripslashes(string str)
//Use pattern rules to analyze the comparison For string string, the value returned by the comparison result is placed in the array parameter regs. The content of regs[0]
is the original string string. regs[1] is the first string that conforms to the rules. regs[2 ] is the second regular string
, and so on. If the parameter regs is omitted, it is simply compared. If found, the return value is true
int ereg(string pattern,string string ,array)[regs])
//Similar to ereg(), the difference is that ereg() is case-sensitive, this function has nothing to do with case
int eregi(string pattern,string string, array[regs])
//This function uses pattern rules to analyze and compare string strings, and the character to be replaced is the parameter replacement. The return value
is a string type
string ereg_replace(string pattern,string replacement,string string)
//Construct a case-insensitive replacement regular expression
string eregi_replace(string pattern,string replacement,string string)
//The return value after cutting is an array variable. The parameter pattern is the specified rule string, the parameter string is the string to be processed
, and the parameter limit can be omitted, indicating that the maximum number of qualified values to be processed is. It is worth noting that the pattern parameter of this function is case-sensitive
array split(string pattern,string string,int[limit])
//This function can return the characters of the string to upper and lower cases word by word .In PHP use, this function has no effect, but it may be able to provide external
processing or database processing.
string sql_regcase(string string)
//Storage data in byte-stream mode. Variable value is a mixed type, which can include integers, double-precision floating-point number strings, arrays,
and object properties (object methods are not saved)
string serialize(mixed value)
// Data stored in the system in byte-stream mode can be retrieved
mixed unserialize(string str)

Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics



PHP 8.4 brings several new features, security improvements, and performance improvements with healthy amounts of feature deprecations and removals. This guide explains how to install PHP 8.4 or upgrade to PHP 8.4 on Ubuntu, Debian, or their derivati

CakePHP is an open-source framework for PHP. It is intended to make developing, deploying and maintaining applications much easier. CakePHP is based on a MVC-like architecture that is both powerful and easy to grasp. Models, Views, and Controllers gu

Visual Studio Code, also known as VS Code, is a free source code editor — or integrated development environment (IDE) — available for all major operating systems. With a large collection of extensions for many programming languages, VS Code can be c

CakePHP is an open source MVC framework. It makes developing, deploying and maintaining applications much easier. CakePHP has a number of libraries to reduce the overload of most common tasks.

This tutorial demonstrates how to efficiently process XML documents using PHP. XML (eXtensible Markup Language) is a versatile text-based markup language designed for both human readability and machine parsing. It's commonly used for data storage an

A string is a sequence of characters, including letters, numbers, and symbols. This tutorial will learn how to calculate the number of vowels in a given string in PHP using different methods. The vowels in English are a, e, i, o, u, and they can be uppercase or lowercase. What is a vowel? Vowels are alphabetic characters that represent a specific pronunciation. There are five vowels in English, including uppercase and lowercase: a, e, i, o, u Example 1 Input: String = "Tutorialspoint" Output: 6 explain The vowels in the string "Tutorialspoint" are u, o, i, a, o, i. There are 6 yuan in total

The following resources contain additional information on CakePHP. Please use them to get more in-depth knowledge on this.

If you are an experienced PHP developer, you might have the feeling that you’ve been there and done that already.You have developed a significant number of applications, debugged millions of lines of code, and tweaked a bunch of scripts to achieve op
