PHP 8.4.1 Released!

Costanti predefinite

Le costanti qui elencate sono sempre disponibili in quanto parte del core di PHP.

Nota: You may use these constant names in php.ini but not outside of PHP, like in httpd.conf, where you'd use the bitmask values instead.

Errors and Logging
Value Constant Description Note
1 E_ERROR (int) Fatal run-time errors. These indicate errors that can not be recovered from, such as a memory allocation problem. Execution of the script is halted.  
2 E_WARNING (int) Run-time warnings (non-fatal errors). Execution of the script is not halted.  
4 E_PARSE (int) Compile-time parse errors. Parse errors should only be generated by the parser.  
8 E_NOTICE (int) Run-time notices. Indicate that the script encountered something that could indicate an error, but could also happen in the normal course of running a script.  
16 E_CORE_ERROR (int) Fatal errors that occur during PHP's initial startup. This is like an E_ERROR, except it is generated by the core of PHP.  
32 E_CORE_WARNING (int) Warnings (non-fatal errors) that occur during PHP's initial startup. This is like an E_WARNING, except it is generated by the core of PHP.  
64 E_COMPILE_ERROR (int) Fatal compile-time errors. This is like an E_ERROR, except it is generated by the Zend Scripting Engine.  
128 E_COMPILE_WARNING (int) Compile-time warnings (non-fatal errors). This is like an E_WARNING, except it is generated by the Zend Scripting Engine.  
256 E_USER_ERROR (int) User-generated error message. This is like an E_ERROR, except it is generated in PHP code by using the PHP function trigger_error().  
512 E_USER_WARNING (int) User-generated warning message. This is like an E_WARNING, except it is generated in PHP code by using the PHP function trigger_error().  
1024 E_USER_NOTICE (int) User-generated notice message. This is like an E_NOTICE, except it is generated in PHP code by using the PHP function trigger_error().  
2048 E_STRICT (int) Enable to have PHP suggest changes to your code which will ensure the best interoperability and forward compatibility of your code.  
4096 E_RECOVERABLE_ERROR (int) Catchable fatal error. It indicates that a probably dangerous error occurred, but did not leave the Engine in an unstable state. If the error is not caught by a user defined handle (see also set_error_handler()), the application aborts as it was an E_ERROR.  
8192 E_DEPRECATED (int) Run-time notices. Enable this to receive warnings about code that will not work in future versions.  
16384 E_USER_DEPRECATED (int) User-generated warning message. This is like an E_DEPRECATED, except it is generated in PHP code by using the PHP function trigger_error().  
32767 E_ALL (int) All errors, warnings, and notices.  

The above values (either numerical or symbolic) are used to build up a bitmask that specifies which errors to report. You can use the bitwise operators to combine these values or mask out certain types of errors. Note that only '|', '~', '!', '^' and '&' will be understood within php.ini.

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User Contributed Notes 8 notes

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24
Andy at Azurite (co uk)
13 years ago
-1 is also semantically meaningless as a bit field, and only works in 2s-complement numeric representations. On a 1s-complement system -1 would not set E_ERROR. On a sign-magnitude system -1 would set nothing at all! (see e.g. http://en.wikipedia.org/wiki/Ones%27_complement)

If you want to set all bits, ~0 is the correct way to do it.

But setting undefined bits could result in undefined behaviour and that means *absolutely anything* could happen :-)
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23
russthom at fivegulf dot com
12 years ago
[Editor's note: fixed E_COMPILE_* cases that incorrectly returned E_CORE_* strings. Thanks josiebgoode.]

The following code expands on Vlad's code to show all the flags that are set. if not set, a blank line shows.

<?php
$errLvl
= error_reporting();
for (
$i = 0; $i < 15; $i++ ) {
print
FriendlyErrorType($errLvl & pow(2, $i)) . "<br>\\n";
}

function
FriendlyErrorType($type)
{
switch(
$type)
{
case
E_ERROR: // 1 //
return 'E_ERROR';
case
E_WARNING: // 2 //
return 'E_WARNING';
case
E_PARSE: // 4 //
return 'E_PARSE';
case
E_NOTICE: // 8 //
return 'E_NOTICE';
case
E_CORE_ERROR: // 16 //
return 'E_CORE_ERROR';
case
E_CORE_WARNING: // 32 //
return 'E_CORE_WARNING';
case
E_COMPILE_ERROR: // 64 //
return 'E_COMPILE_ERROR';
case
E_COMPILE_WARNING: // 128 //
return 'E_COMPILE_WARNING';
case
E_USER_ERROR: // 256 //
return 'E_USER_ERROR';
case
E_USER_WARNING: // 512 //
return 'E_USER_WARNING';
case
E_USER_NOTICE: // 1024 //
return 'E_USER_NOTICE';
case
E_STRICT: // 2048 //
return 'E_STRICT';
case
E_RECOVERABLE_ERROR: // 4096 //
return 'E_RECOVERABLE_ERROR';
case
E_DEPRECATED: // 8192 //
return 'E_DEPRECATED';
case
E_USER_DEPRECATED: // 16384 //
return 'E_USER_DEPRECATED';
}
return
"";
}
?>
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15
fadhilinjagi at gmail dot com
3 years ago
A simple and neat way to get the error level from the error code. You can even customize the error level names further.

<?php
$exceptions
= [
E_ERROR => "E_ERROR",
E_WARNING => "E_WARNING",
E_PARSE => "E_PARSE",
E_NOTICE => "E_NOTICE",
E_CORE_ERROR => "E_CORE_ERROR",
E_CORE_WARNING => "E_CORE_WARNING",
E_COMPILE_ERROR => "E_COMPILE_ERROR",
E_COMPILE_WARNING => "E_COMPILE_WARNING",
E_USER_ERROR => "E_USER_ERROR",
E_USER_WARNING => "E_USER_WARNING",
E_USER_NOTICE => "E_USER_NOTICE",
E_STRICT => "E_STRICT",
E_RECOVERABLE_ERROR => "E_RECOVERABLE_ERROR",
E_DEPRECATED => "E_DEPRECATED",
E_USER_DEPRECATED => "E_USER_DEPRECATED",
E_ALL => "E_ALL"
];

echo
$exceptions["1"];
$code = 256;
echo
$exceptions[$code];
?>

Output:
E_ERROR
E_USER_ERROR

This will need updating when PHP updates the error level names. Otherwise, it works just fine.
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15
bbrokman at gmail dot com
5 years ago
A neat way to have a place in code to control error reporting configuration :)

<?php

$errorsActive
= [
E_ERROR => FALSE,
E_WARNING => TRUE,
E_PARSE => TRUE,
E_NOTICE => TRUE,
E_CORE_ERROR => FALSE,
E_CORE_WARNING => FALSE,
E_COMPILE_ERROR => FALSE,
E_COMPILE_WARNING => FALSE,
E_USER_ERROR => TRUE,
E_USER_WARNING => TRUE,
E_USER_NOTICE => TRUE,
E_STRICT => FALSE,
E_RECOVERABLE_ERROR => TRUE,
E_DEPRECATED => FALSE,
E_USER_DEPRECATED => TRUE,
E_ALL => FALSE,
];

error_reporting(
array_sum(
array_keys($errorsActive, $search = true)
)
);

?>
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12
cl at viazenetti dot de
6 years ago
An other way to get all PHP errors that are set to be reported. This code will even work, when additional error types are added in future.

<?php
$pot
= 0;
foreach (
array_reverse(str_split(decbin(error_reporting()))) as $bit) {
if (
$bit == 1) {
echo
array_search(pow(2, $pot), get_defined_constants(true)['Core']). "<br>\n";
}
$pot++;
}
?>
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6
kezzyhko at NOSPAM dot semysha dot ru
8 years ago
As for me, the best way to get error name by int value is that. And it's works fine for me ;)
<?php

array_flip
(array_slice(get_defined_constants(true)['Core'], 1, 15, true))[$type];

//the same in readable form
array_flip(
array_slice(
get_defined_constants(true)['Core'],
1,
15,
true
)
)[
$type]

?>
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3
kaioker
3 years ago
super simple error code to human readable conversion:

function prettycode($code){
return $code == 0 ? "FATAL" : array_search($code, get_defined_constants(true)['Core']);
}
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1
ErikBachmann
5 years ago
<?php
function getErrorTypeByValue($type) {
$constants = get_defined_constants(true);

foreach (
$constants['Core'] as $key => $value ) { // Each Core constant
if ( preg_match('/^E_/', $key ) ) { // Check error constants
if ( $type == $value )
return(
"$key=$value");
}
}
}
// getErrorTypeByValue()

echo "[".getErrorTypeByValue( 1 ) . "]". PHP_EOL;
echo
"[".getErrorTypeByValue( 0 ) . "]". PHP_EOL;
echo
"[".getErrorTypeByValue( 8 ) . "]". PHP_EOL;
?>

Will give
[E_ERROR=1]
[]
[E_NOTICE=8]
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