array representation backward compat for php5
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@ -165,7 +165,7 @@ documentation below for more information.
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The ouput file MUST use the PNG extension.
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```php
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$waveform = $audio->waveform(640, 120, ['#00FF00']);
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$waveform = $audio->waveform(640, 120, array('#00FF00'));
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$waveform->save('waveform.png');
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```
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