


Syntax: mixed preg_replace(mixed pattern, mixed replacement, mixed subject);
Return value: Mixed type data
Function type: Data processing
Content description: This function uses pattern rules to parse and compare the string subject, and the string to be replaced is the parameter replacement. The return value is mixed type data, which is the string result after substitution.
1. preg_replace()
$msg = preg_replace("//is", "", $msg); -----Delete and the middle ones Part
$msg = preg_replace("/]+>/", "", $msg); -----Delete and the content in between
i (PCRE_CASELESS)
If this modifier is set, characters in the pattern will match both uppercase and lowercase letters.
s (PCRE_DOTALL)
If this modifier is set, the dot metacharacter (.) in the pattern matches all characters, including newlines. Without this setting, newline characters are not included. This is equivalent to Perl's /s modifier. Excluded character classes such as [^a] always match newlines, regardless of whether this modifier is set.
2. ereg() and eregi()
Note: The preg_match() function is often a faster alternative to ereg()
eregi("
]+)>(.+)",$data,$b)----Check whether there is a body tag in $data. If so, assign the parameter $b[0] and the middle part $b[1].bool ereg ( string pattern, string string [, array regs] )
int eregi ( string pattern, string string, array [regs] )
eregi() is similar to ereg() and has the same usage. The difference is that ereg() is case-sensitive, while eregi() is case-insensitive
//Comparison of the use of preg_replace() and ereg_replace() functions
// -------preg_replace()--------------------------
//1. Search and replace strings
$ Str = "Daoyu shi Ge hao hai Zi 5555";
$pattern = "/s/"; // An error will occur if the variable is defined as $pattern_1
echo $str."
";
//Method 1
$pat
=preg_replace($pat,"$1",$str);
echo $str."
";
//Note: If it is in the following form, you will find that the matching is: zi-, so it can be thought that in the case of {6} with a number of times, he ($1) matches the last time
=preg_replace($pat,"$1",$str);
echo $str."
";
$str = "daoyu-shi-ge-hao-hai-zi-5555";
$pat
echo $str."
";
//Note: When the regular expression is written as $pat= "/((w+)-){6}(d+)/i";, it is the same as the above situation
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php把负数转为正整数的方法:1、使用abs()函数将负数转为正数,使用intval()函数对正数取整,转为正整数,语法“intval(abs($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。

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。

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。

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。

php判断有没有小数点的方法:1、使用“strpos(数字字符串,'.')”语法,如果返回小数点在字符串中第一次出现的位置,则有小数点;2、使用“strrpos(数字字符串,'.')”语句,如果返回小数点在字符串中最后一次出现的位置,则有。


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