if ( $matches ) {
$p = $this->getModulePrefix();
$this->dieUsage(
- "Cannot use {$p}prop=" . join( '|', array_keys( $matches ) ) . " with {$p}unique",
+ "Cannot use {$p}prop=" . implode( '|', array_keys( $matches ) ) . " with {$p}unique",
'params'
);
}