怪异的php 语法, 求解!
发现一个php用来判断一个字符串是否包子串的语句相当的怪异.
看下面的语句:
echo "A1: ".(strpos("csd","c"))."
";
echo "A2: ".(strpos("csd","c")>=0)."
";
echo "B1: ".(strpos("csd","h",0))."
";
echo "B2: ".(strpos("csd","h",0)>=0)."
";
if(strpos("abc","a")>=0)
{
echo "a in abc"."
";
}
else
{
echo "a not in abc"."
";
}
if(strpos("abc","u")>=0)
{
echo "u in abc"."
";
}
else
{
echo "u not in abc"."
";
}
if(strpos("a","abc")>=0)
{
echo "abc in a"."
";
}
else
{
echo "abc not in a"."
";
}
if(strpos("u","abc")>=0)
{
echo "abc in u"."
";
}
else
{
echo "abc not in u"."
";
}
strpos
//显示的结果
A1: 0
A2: 1
B1:
B2: 1
a in abc
u in abc
abc in a
abc in u
定义和用法
strpos() 函数返回字符串在另一个字符串中第一次出现的位置。
如果没有找到该字符串,则返回 false。
语法
strpos(string,find,start)
string | 必需。规定被搜索的字符串。 |
find | 必需。规定要查找的字符。 |
start | 可选。规定开始搜索的位置。 |
请教,在这里,比如我要判断 字符串"abc" 里包含 "a", 用哪个方法比较好呢?

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

In this chapter, we will understand the Environment Variables, General Configuration, Database Configuration and Email Configuration in CakePHP.

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

To work with date and time in cakephp4, we are going to make use of the available FrozenTime class.

To work on file upload we are going to use the form helper. Here, is an example for file upload.

In this chapter, we are going to learn the following topics related to routing ?

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

Validator can be created by adding the following two lines in the controller.
