


3 solutions to the PHP error Allowed memory size of 67108864 bytes exhausted, 67108864exhausted
Today when I was reading PHP related information on Baidu, I found a netizen asked a question about a wordpress installation error. He said that he encountered such a problem when installing the wordpress installation package: Fatal error: Allowed memory size of 67108864 bytes exhausted ( tried to allocate 76 bytes) in… I have never encountered this problem before. According to the prompts, it must be caused by memory overflow. As for why such a prompt appears? Below I will share the error causes and solutions I compiled with PHPer, hoping it will be helpful.
Error reason:
Because the maximum memory consumed by a PHP page is 8M by default (can be seen in PHP's php.ini configuration file), if the file is too large or the image is too large, the above error message will occur when reading.
Solution, I currently know of three solutions:
The first solution is: Add ini_set("memory_limit", "80M") to the PHP file; of course, 80M can be changed according to your own situation, and it should not be too large, otherwise the system will There will be problems with resources, and -1 means no limit.
The second solution is: Modify the php.ini configuration file and find
in php.ini
; http://php.net/memory-limit
memory_limit = 16M, remove the semicolon in front, change the value, change memory_limit from 8M to 16M (or larger), and restart the apache service.
The third solution is: Modify the .htaccess distributed configuration file (note: the premise is that the directory supports .htaccess). Add a new sentence in the document: php_value memory_limit 16M (or greater)
Allowed memory size of 33554432 bytes exhausted (tried to allocate 7680 The problem is that the WP_MEMORY_LIMIT definition is too small, but the current method on the Internet is called changing wp-settings
The reason for this error:
is because the maximum memory consumed by the PHP page is 8M by default (can be seen in the PHP ini file). If the file is too large or the image is too large, it will not be read. The above error will occur.
Solution:
1. Modify php.ini
Change the memory_limit from 8M to 16M (or larger), restart the apache service
2. In PHP Add ini_set("memory_limit", "100M");
Note: For the normal use of other resources of the system, please do not set the memory_limit too large, where -1 means no limit
3. Modify the .htaccess document (provided that the directory supports .htaccess)
Add a sentence in the document: php_value memory_limit 16M (or greater)

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。

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。

在PHP中,可以利用implode()函数的第一个参数来设置没有分隔符,该函数的第一个参数用于规定数组元素之间放置的内容,默认是空字符串,也可将第一个参数设置为空,语法为“implode(数组)”或者“implode("",数组)”。


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