php - Stupid question - could someone explain str_replace("/", DS, $uploadTo) to me -

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  $ upload_dir = WWW_ROOT.str_replace ("/", डीएस, $ अपलोड करने के लिए);   
 डीएस मतलब क्या है? Google ने मुझे बुद्धिमानी को छोड़ दिया: (  
 
 
 संदर्भ के आधार पर, मैं एक पैंट ले जा रहा हूँ और कहते हैं कि  डीएस  के लिए 'निर्देशिका विभाजक' का अर्थ है। अपना कोड खोजें, कहीं आप इस तरह एक पंक्ति पाएं:  
  परिभाषित करें ('डी एस', $ कुछ वैल्यू) ;

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