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best practice to generate random token for forgot password

I want to generate identifier for forgot password . I read i can do it by using timestamp with mt_rand(), but some people are saying that time stamp might not be unique every time. So i am bit of confused here. Can i do it with using time stamp with this ? ...
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NSUserDefaults removeObjectForKey vs. setObject:nil

Are the following two lines equivalent? 3 Answers 3 ...
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Moving and vanishing lines of code; trouble with Eclipse's XML Editor

Sometimes my code moves on its own or just disappears in the Eclipse XML editor. 7 Answers ...
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How to check if a variable is set in Bash?

How do I know if a variable is set in Bash? 33 Answers 33 ...
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How can I get a JavaScript stack trace when I throw an exception?

If I throw a JavaScript exception myself (eg, throw "AArrggg" ), how can I get the stack trace (in Firebug or otherwise)? Right now I just get the message. ...
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what is the unsigned datatype?

I've seen this unsigned "typeless" type used a couple of times, but never seen an explanation for it. I suppose there's a corresponding signed type. Here's an example: ...
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What do the terms “CPU bound” and “I/O bound” mean?

What do the terms "CPU bound" and "I/O bound" mean? 11 Answers 11 ...
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How to count total lines changed by a specific author in a Git repository?

Is there a command I can invoke which will count the lines changed by a specific author in a Git repository? I know that there must be ways to count the number of commits as Github does this for their Impact graph. ...
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What is the easiest/best/most correct way to iterate through the characters of a string in Java?

StringTokenizer ? Convert the String to a char[] and iterate over that? Something else? 15 Answers ...
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Converting a List to a comma separated string

Is there a way to take a List and convert it into a comma separated string? 8 Answers ...