PHP-FIG中PSR-1有这样一段描述FilesSHOULDeitherdeclaresymbols(classes,functions,constants,etc.)orcauseside-effects(e.g.generateoutput,change.inisettings,etc.)butSHOULDNOTdoboth.其中side-effects(e.g.generateoutput,change.inisettings,etc.)不明其意,请高手们赐教
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