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Logging and Reporting

error_log($s1[,$i=0[,$s2[,$s3]]]) sends an error message $s1 somewhere. It returns TRUE on success and FALSE on failure. $i can be:

0 		sends $s1 to PHP’s system logger
1 sends $s1 as an email to the address in $s2, using the extra headers $s3
2 no longer an option
3 appends $s1 to the file $s2
4 sends $s1 to the SAPI logging handler 

<!DOCTYPE html><html><head></head>
<body><?php
error_log("\nTesting 123. An error has occurred.\n",0);

if (error_log("\nTesting 123. An error has occurred.\n",1,"fragment_shader@yahoo.com")){
   echo "Error Logging Successful.";
}

print_r(error_get_last());

error_log("\nTesting 123. An error has occurred.\n",3,"error.txt");

?> </body></html>

Error Logging Successful.
error_reporting([$i]) sets the error_reporting directive at runtime. It returns the old error_reporting level. $i can be:

constant of error level 		value
E_ERROR 1
E_WARNING 2
E_PARSE 4
E_NOTICE 8
E_CORE_ERROR 16
E_CORE_WARNING 32
E_COMPILE_ERROR 64
E_COMPILE_WARNING 128
E_USER_ERROR 256
E_USER_WARNING 512
E_USER_NOTICE 1024
E_STRICT 2048
E_RECOVERABLE_ERROR 4096
E_DEPRECATED 8192
E_USER_DEPRECATED 16384
E_ALL 32767 

<!DOCTYPE html><html><head></head>
<body><?php
// Turn off all error reporting
error_reporting(0);

// Report simple running errors
error_reporting(E_ERROR | E_WARNING | E_PARSE);

// Reporting E_NOTICE can be good too (to report uninitialized
// variables or catch variable name misspellings ...)
error_reporting(E_ERROR | E_WARNING | E_PARSE | 
                       E_NOTICE);

// Report all errors except E_NOTICE
// This is the default value set in php.ini
error_reporting(E_ALL ^ E_NOTICE);

// Report all PHP errors (see changelog)
error_reporting(E_ALL);

// Report all PHP errors
error_reporting(-1);

// Same as error_reporting(E_ALL);
ini_set('error_reporting', E_ALL);

?> </body></html>