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example function param 1 requires string

An int causes a PHP errorargument#1 ($line) must be of type int, string given,

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Original file line number	Diff line number	Diff line change
`@@ -627,7 +627,7 @@ For example, to get a dump as a string in a variable, you can do::`
`627`	`627`
`628`	`628`	`$dumper->dump(`
`629`	`629`	`$cloner->cloneVar($variable),`
`630`		`- function (int $line, int $depth) use (&$output): void {`
	`630`	`+ function (string $line, int $depth) use (&$output): void {`
`631`	`631`	`// A negative depth means "end of dump"`
`632`	`632`	`if ($depth >= 0) {`
`633`	`633`	`// Adds a two spaces indentation to the line`

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