PHP: Variable empty or not set or what? -

-

इन चार PHP स्टेटमेंट्स में क्या अंतर है? 

  if (isset ($ डेटा )) (यदि (! खाली ($ डेटा)) {यदि ($ डेटा! = '') {If ($ डेटा) {

क्या वे सब एक ही करते हैं? 

  यदि (isset ($ डेटा))

परिवर्तनीय सिर्फ सेट है - उस रेखा से पहले हमने नाम 'डेटा' के साथ नया वैरिएबल घोषित किया है, अर्थात $ डेटा = 'एबीसी'; 

  यदि (खाली ($ डेटा)) ( 
 वेरिएबल डेटा से भरा हुआ है। इसमें खाली सरणी नहीं हो सकती है, क्योंकि तब  $ डेटा  में सरणी प्रकार है लेकिन उसके पास अभी कोई डेटा नहीं है, अर्थात $ data = array (1); शून्य, खाली स्ट्रिंग, रिक्त सारणी, रिक्त ऑब्जेक्ट, 0, आदि नहीं हो सकता। 
 
  यदि ($ डेटा! = '') {  
 वेरिएबल खाली स्ट्रिंग नहीं है लेकिन खाली मूल्य (ऊपर दिए गए उदाहरण) नहीं हो सकते। 
 अगर हम प्रकारों की तुलना करना चाहते हैं, तो ! ==  या  ===  का उपयोग करें। 
 
  यदि ($ डेटा) {  
 चर किसी भी डेटा के साथ भरा है ! खाली ($ डेटा) ।

Comments

Post a Comment

Popular posts from this blog

c# - How to capture HTTP packet with SharpPcap -

-
I would like to capture all incoming HTTP packets on my machine. To do this, I am using SharpPcap which is a WinPcap The cover is. SharpPcap works very well, but it captures TCP packets and what it wants to do for me is a very low level. Does anyone know how can I easily get full HTTP requests / reactions from all these TCP packets? Thanks SharpPcap is already able to capture the packet in the same way That's what the virus does (just in the code instead of the GUI). And you can either either parse them directly or you can put them in the drive in the common .pcap file format. The steps to parse the capture are: Open a connection at any time Loop a while Or start capturing using an event callback Parsing the raw packet for the type you want If you are reading .PPP dump files In addition to calling you an offline capture reader is almost the same, there is no need to select an interface, and you can set the majority There is no need to do the modes. All st...
Read more

php - Multiple Select with Explode: only returns the word "Array" -

-
By using Wordpress I have created a multiple selection box so that users can select categories to exclude. When the page is initially loaded, I see my predefined default option. However, when I select a new value and I save ... I only see the word "Array" and have not chosen anything else? & lt; Class = "amultiple" id = "& lt; php echo $ value ['id'] ;? gt;" name = "& gt; php echo $ value ['id'] ;; gt; []" Multiple = "multiple" size = "8" & gt; & Lt ;? Php global option; Foreign currency ($ value as value $) {if (get_settings ($ value ['id']) === FALSE {$$ value ['id'] = $ value ['std']; } And {$$ value ['id'] = get_settings ($ value ['id']); }} $ Ranges = & amp; Amp; Categories ('type = post & orderbiz = name & amp; hide_empty = 1'); If ($ ranges) {$ ex_cat = implode (',', $ tt_cat_exclude); Forex Currency ($ range a...
Read more

php - jQuery AJAX Post not working -

-
I do not understand why this script does not work. It has something to do within AJAX PostScript / Function. Right now, when I submit my form, it runs php code on the same page. What it should do, send the values ​​of the form for Project_Azax.fp, then there will be a refund of success on the page which is correct or false. $ (document) .ready (function () {$ ('div # didIt'). Hide (); $ ('form [name = adminForm]'). Submit (function () ($ {'.post' ('/ project_ajax.php', {action: $ ('[name = action]') Val (), pId: $ ('[name = pId]'). Val (), name ('[Name = name]'. Val (), url: $ ('[url = url]'). Val (), summary: ('[summary = summary]'). Val ()}, Function (data) {if (data.success) {$ ('div # didIt') .Sliddown ('slow');} and {warning ('unsuccessful SA!');}}, 'Jason'); return false ;});}); What is the code for project_ajax.php below ... if ($ _ POST ['action'] == ...
Read more