php - IF statement causing 500 Internal Server Error -

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IF स्टेटमेंट नीचे 500 त्रुटि का कारण बनता है 

  $ oldtweets = mysql_query ("चुनें जमा, ट्वीट्स से ट्वीट्स जहां सबमिडीज़ = '$ सबमिड' और लॉगिन आईडी = '$ लॉगिन' "); अगर (mysql_num_rows ($ oldtweets) = 0) {mysql_query ("ट्वीट्स मूल्यों में शामिल करें (शून्य, '$ शहर', '$ जमा करें', '$ पूर्णुल', '$ uid', '$ username', NULL)") ; }    
 
 
 सबसे पहले मैं यह देखूंगा -  
  यदि (mysql_num_rows ($ oldtweets) = 0)   
 यह होना चाहिए -  
  यदि (mysql_num_rows ($ oldtweets) == 0) < / कोड>

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