First we understandWhat is source code?
Source code (also called source program) refers to an uncompiled text file written in accordance with certain programming language specifications. It is a series of human-readable computer language instructions.
In modern programming languages, source code can appear in the form of books or tapes, but the most commonly used format is text files. The purpose of this typical format is to compile a computer program. The ultimate goal of computer source code is to translate human-readable text into binary instructions that the computer can execute. This process is called compilation and is completed through a compiler.
"Source code" is equal to "source file" most of the time.
For example, right-click on this web page and select View Source File. A notepad comes out, and the content inside is the source code of this web page." This sentence reflects their relationship. The source file here refers to the source file of the web page, and the source code is the content of the source file, so it can It is called the source code of the web page.
Source code refers to the original code, which can be any language code.
Source program, source file and source code are the same thing.
SoWhat does php source code mean?
php source code (also called php source program) refers to an uncompiled text file, a paragraph, written in accordance with certain PHP scripting language specifications A program is a series of human-readable computer language instructions.
A PHP web page contains PHP code, then open the entire original file of the web page with an editor, or open it with Notepad, and what you will see is PHP source code.
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php把负数转为正整数的方法:1、使用abs()函数将负数转为正数,使用intval()函数对正数取整,转为正整数,语法“intval(abs($number))”;2、利用“~”位运算符将负数取反加一,语法“~$number + 1”。

实现方法:1、使用“sleep(延迟秒数)”语句,可延迟执行函数若干秒;2、使用“time_nanosleep(延迟秒数,延迟纳秒数)”语句,可延迟执行函数若干秒和纳秒;3、使用“time_sleep_until(time()+7)”语句。

php字符串有下标。在PHP中,下标不仅可以应用于数组和对象,还可应用于字符串,利用字符串的下标和中括号“[]”可以访问指定索引位置的字符,并对该字符进行读写,语法“字符串名[下标值]”;字符串的下标值(索引值)只能是整数类型,起始值为0。

php除以100保留两位小数的方法:1、利用“/”运算符进行除法运算,语法“数值 / 100”;2、使用“number_format(除法结果, 2)”或“sprintf("%.2f",除法结果)”语句进行四舍五入的处理值,并保留两位小数。

在php中,可以使用substr()函数来读取字符串后几个字符,只需要将该函数的第二个参数设置为负值,第三个参数省略即可;语法为“substr(字符串,-n)”,表示读取从字符串结尾处向前数第n个字符开始,直到字符串结尾的全部字符。

判断方法:1、使用“strtotime("年-月-日")”语句将给定的年月日转换为时间戳格式;2、用“date("z",时间戳)+1”语句计算指定时间戳是一年的第几天。date()返回的天数是从0开始计算的,因此真实天数需要在此基础上加1。

方法:1、用“str_replace(" ","其他字符",$str)”语句,可将nbsp符替换为其他字符;2、用“preg_replace("/(\s|\ \;||\xc2\xa0)/","其他字符",$str)”语句。

查找方法:1、用strpos(),语法“strpos("字符串值","查找子串")+1”;2、用stripos(),语法“strpos("字符串值","查找子串")+1”。因为字符串是从0开始计数的,因此两个函数获取的位置需要进行加1处理。


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