is_serialized( string $data, bool $strict = true ): bool
Checks value to find if it was serialized.
Contents
Description
If $data is not a string, then returned value will always be false.
Serialized data is always a string.
Parameters
-
$data
string Required -
Value to check to see if was serialized.
-
$strict
bool Optional -
Whether to be strict about the end of the string.
Default:
true
Return
bool False if not serialized and true if it was.
More Information
Usage:
is_serialized( $data );
Notes:
Data might need to be serialized to allow it to be successfully stored and retrieved from a database in a form that PHP can understand.
Source
File: wp-includes/functions.php
.
View all references
function is_serialized( $data, $strict = true ) {
// If it isn't a string, it isn't serialized.
if ( ! is_string( $data ) ) {
return false;
}
$data = trim( $data );
if ( 'N;' === $data ) {
return true;
}
if ( strlen( $data ) < 4 ) {
return false;
}
if ( ':' !== $data[1] ) {
return false;
}
if ( $strict ) {
$lastc = substr( $data, -1 );
if ( ';' !== $lastc && '}' !== $lastc ) {
return false;
}
} else {
$semicolon = strpos( $data, ';' );
$brace = strpos( $data, '}' );
// Either ; or } must exist.
if ( false === $semicolon && false === $brace ) {
return false;
}
// But neither must be in the first X characters.
if ( false !== $semicolon && $semicolon < 3 ) {
return false;
}
if ( false !== $brace && $brace < 4 ) {
return false;
}
}
$token = $data[0];
switch ( $token ) {
case 's':
if ( $strict ) {
if ( '"' !== substr( $data, -2, 1 ) ) {
return false;
}
} elseif ( ! str_contains( $data, '"' ) ) {
return false;
}
// Or else fall through.
case 'a':
case 'O':
case 'E':
return (bool) preg_match( "/^{$token}:[0-9]+:/s", $data );
case 'b':
case 'i':
case 'd':
$end = $strict ? '$' : '';
return (bool) preg_match( "/^{$token}:[0-9.E+-]+;$end/", $data );
}
return false;
}
Changelog
Version | Description |
---|---|
6.1.0 | Added Enum support. |
2.0.5 | Introduced. |
User Contributed Notes
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If it is not serialized, then serialize array into a string format.