2. how does PHP record errors and send errors?

2. how does PHP record errors and send errors? 1. record the error to the specified file. the configuration process is as follows:
* 1). log_errors = on
* 2). error_log =/tmp/php_error.log
1. use the error_log () function to record error logs
Error_log ('error message to be logged! ');

Header ('content-type: text/html; charset = utf-8 '); // enable all error reports error_reporting (-1); // Set the time zone ini_set ('date. timezone ', 'prc'); // The error ini_set ('display _ errors', 0) is disabled on the page; // enable the logging function ini_set ('log _ errors ', 1); // set the location where error logs are stored, ini_set ('error _ log', '/tmp/custom_error.log '); // ignore duplicate error ini_set ('ignore _ repeated_errors ', 'on'); // ignore duplicate error source ini_set ('ignore _ repeated_source', 'on '); error_log ('I want to record you to my custom error log '. date ('Y-m-d H: I: S', time ())); trigger_error ('trigger _ error ----- I want to record you to my system error log '. date ('Y-m-d H: I: S', time (), E_USER_NOTICE); settype ($ var, 'king ');

2. record errors to system logs
* 1. ini_set ('error _ log', 'syslog '); commonly used

Method 1 // enable all error reports error_reporting (-1); // disable the page to display the error ini_set ('display _ errors ', 0 ); // enable the logging function ini_set ('log _ errors ', 1); // set the location where error logs are stored ------ (System log) ini_set ('error _ log ', 'syslog '); // ignore duplicate error ini_set ('ignore _ repeated_errors', 'on'); // ignore duplicate error source ini_set ('ignore _ repeated_source ', 'on'); // error_log ('error _ log ----- I want to record you to my system error log '. date ('Y-m-d H: I: S', time ())); trigger_error ('trigger _ error ----- I want to record you to my system error log '. date ('Y-m-d H: I: S', time (), E_USER_NOTICE); // settype ($ var, 'king '); method 2 ====================/// openlog ('php5. 6.0 ', LOG_PID, LOG_SYSLOG); syslog (LOG_ERR, 'This is a test syslog '. date ('Y-m-d H: I: S', time (); closelog ();

2. send the error log by email
* 1. error_log ('MSG ', 1, mail_addr); the second parameter is set to 1
** Bool error_log (string $ message [, int $ message_type = 0 [, string $ destination [, string $ extra_headers])

Error message to be recorded. Where should the message_type setting error be sent. The possible information types are as follows: error_log () the log type 0 message is sent to the PHP System Log. the operating system's log mechanism or a file depends on what the error_log command sets. This is a default option. 1. message is sent to the email address set by destination. The fourth parameter extra_headers is used only in this type. 2 is no longer an option. 3. the message is sent to the file at the destination location. The message character is not treated as a new row by default. 4. message is directly sent to the SAPI log handler. Destination target. Its meaning is described above and determined by the message_type parameter. Extra_headers. It is used when message_type is set to 1. This information type uses the same built-in function of mail.

// Enable all error reports: error_reporting (-1); // disable the ini_set ('display _ errors ', 0 ); // enable the logging function ini_set ('log _ errors ', 1); // ignore duplicate errors ini_set ('ignore _ repeated_errors', 'on '); // ignore repeated error sources ini_set ('ignore _ repeated_source ', 'on'); // set the second parameter to 1, use the error log message error_log ('error _ log ----- I want to record you to my system error log '. date ('Y-m-d H: I: S', time (), 1, '2017 @ qq.com ');

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