We have shared PHP learning record experience one with you in the previous article. In this article, we will continue to share PHP learning record experience two with you. We hope it can help everyone.
12. When using thinkPHP, when assembling the save sql statement, you cannot use save($status['save']); you must use save($status);
13. (int) parameter Put (int) in front of the parameter to force conversion to int type. Other types are also available. Change the type.
14. json_decode() accepts a JSON encoded string and converts it into a PHP variable, array mode.
json_encode() JSON encodes variables
15. The str_replace() function replaces the character "world" in the string "Hello world!" with "Shanghai":
<?phpecho str_replace("world","Shanghai","Hello world!");?>
16. is_array() determines whether the variable type is an array type.
17. The array() function is used to create an array.
18. serialize — Generate a storable representation of a value
19. var_export — Output or return a string representation of a variable
20. PHP file_put_contents function (' wxid.log', "[".time_format(time(),'Y-m-d H:i:s').'121'.$SendUser."]\n".var_export($map,true)."\n" ,FILE_APPEND);
is used to output logs and print logs. wxid.log is a file that stores logs. $map is an array containing the information you want to see.
FILE_APPEND is Added viewing methods.
21.
$page=$_GET['page']; $page1=($page-1)*10; $sql="select * from gh_09609b5c87c2.wxch_user order by uid desc limit $page1,10 ";
Transmit paging information, use limit page number, and display the quantity on 1 page, use order by and add the sort field to sort by.
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PHP learning record sharing one
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php把负数转为正整数的方法:1、使用abs()函数将负数转为正数,使用intval()函数对正数取整,转为正整数,语法“intval(abs($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。

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。

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。

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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