Solution to php not displaying error messages: First open the "etc/php.ini" file in the php directory; then add the content as "error_reporting(E_ALL);ini_set('display_errors','On') ;";Finally save the file.
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On some servers, when the PHP code execution error occurs, browse The programmer will only display 500 errors, which is not conducive for programmers to locate error codes.
There are 2 settings for turning on PHP error message display:
1: error_reporting = error reporting level (if it is development mode, please set it to: E_ALL)
2: display_errors = On
These two settings are indispensable. When display_errors=Off, no error information will be displayed no matter what level error_reporting is set to.
Setting method:
1: Modify the etc/php.ini file in the php directory
2: Add to the php code:
error_reporting(E_ALL); ini_set(‘display_errors’,’On’);
Attached error_reporting error level code:
值 常量 描述 1 E_ERROR 致命的运行错误。错误无法恢复,暂停执行脚本。 2 E_WARNING 运行时警告(非致命性错误)。非致命的运行错误,脚本执行不会停止。 4 E_PARSE 编译时解析错误。解析错误只由分析器产生。 8 E_NOTICE 运行时提醒(这些经常是你代码中的bug引起的,也可能是有意的行为造成的。) 16 E_CORE_ERROR PHP启动时初始化过程中的致命错误。 32 E_CORE_WARNING PHP启动时初始化过程中的警告(非致命性错)。 64 E_COMPILE_ERROR 编译时致命性错。这就像由Zend脚本引擎生成了一个E_ERROR。 128 E_COMPILE_WARNING 编译时警告(非致命性错)。这就像由Zend脚本引擎生成了一个E_WARNING警告。 256 E_USER_ERROR 用户自定义的错误消息。这就像由使用PHP函数trigger_error(程序员设置E_ERROR) 512 E_USER_WARNING 用户自定义的警告消息。这就像由使用PHP函数trigger_error(程序员设定的一个E_WARNING警告) 1024 E_USER_NOTICE 用户自定义的提醒消息。这就像一个由使用PHP函数trigger_error(程序员一个E_NOTICE集) 2048 E_STRICT 编码标准化警告。允许PHP建议如何修改代码以确保最佳的互操作性向前兼容性。 4096 E_RECOVERABLE_ERROR 开捕致命错误。这就像一个E_ERROR,但可以通过用户定义的处理捕获(又见set_error_handler()) 8191 E_ALL 所有的错误和警告(不包括 E_STRICT) (E_STRICT will be part of E_ALL as of PHP 6.0)
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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。

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)”。

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。


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