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Kirby 5.0.2

filename

Checks for a valid filename

V::filename($value): bool

Parameters

Name Type Default
$valuerequired mixed no default value

Return type

bool

In your code

if (V::filename('myfile.jpg')) {
  echo 'Yay, valid!';
}

In fields

fields:
  example:
    label: Example field
    type: text
    validate: filename