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string
$_characters= ''0123456789X''
Allowed barcode characters
'0123456789X'
Details
_issn(
string $value
)
:
boolean
Validates the checksum () ISSN implementation (reversed mod11)
Name | Type | Description |
---|---|---|
$value | string | The barcode to validate |
Type | Description |
---|---|
boolean |

checkChars(
string $value
)
:
boolean
Allows X on length of 8 chars
Name | Type | Description |
---|---|---|
$value | string | The barcode to check for allowed characters |
Type | Description |
---|---|
boolean |