PHP learning and communication
In writing PHP you will see many fixed keywords and characters like $
Font design and effect:
& lt; i & gt; & lt;/i & gt; used to mark the text oblique body;
& lt; b & lt;/b & gt; To mark the text bold; & & lt; u & gt; & lt;/u & gt; use to mark the lines of text;
& lt; strong & gt; & lt;/strong & gt; ; is also used to mark text in italics;
for paragraphs
Use for line breaks
Pre-formatted tags
, , , Such as bold, italics, underline, subscript, superscript, etc.
Font tag
Lists use
Horizontal line labels
using
;、
Table size keyword
Width
The width of the table, which can be expressed in pixels or percentages
Height
The height of the table, which can be expressed in pixels or percentages
Align
The horizontal alignment of the table on the page
Bgcolor
The background color of the table
Border
The border thickness (pixels) of the table can be set to 0
Bordercolor
The border color of the table
Cellspacing
The spacing between cells
Cellpadding
The spacing between the content in the table and the cells
Finally Let’s look at the difference between single quotes and double quotes in PHP:
1. Strings can be enclosed in single quotes or double quotes. There is no length limit, but strings using double quotes have stronger capabilities. For example, they can identify variables in the string. More escape characters:
echo' simply means
';
$i=10;
echo' I can recognize this variable: $i';
?> If double quotes are used, the displayed result is I can identify this variable: 10
If single quotes are used, the displayed result is I can identify this variable: $ia

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。

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。

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。

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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