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How to solve PHP error 'Notice: Array to string conversion in…'

...n $_POST['C']. So when you echo that, you are trying to print an array, so all it does is print Array and a notice. To print properly an array, you either loop through it and echo each element, or you can use print_r. Alternatively, if you don't know if it's an array or a string or whatever, you c...
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PostgreSQL: How to pass parameters from command line?

...command line (outside the script). I want to avoid going in and replacing all the ? with actual values, instead I'd like to pass the arguments after the query. ...
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What's the difference between ES6 Map and WeakMap?

...e: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/WeakMap): Keys of WeakMaps are of the type Object only. Primitive data types as keys are not allowed (e.g. a Symbol can't be a WeakMap key). Nor can a string, number, or boolean be used as a WeakMap key. A M...
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What is the native keyword in Java for?

...tation doesn’t have to use JNI. Certain JRE methods are handled intrinsically by the JVM. In fact, it’s not even mandatory that the implementation is actually native code. It’s just “implemented in a language other than the Java programming language”. – Holger ...
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Download attachments using Java Mail

Now that I`ve downloaded all the messages, and store them to 4 Answers 4 ...
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When should use Readonly and Get only properties

...Thibault Falise 5,30511 gold badge2424 silver badges3232 bronze badges 14 ...
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How do I determine file encoding in OS X?

... That's a function call you would use if you want to write a program. From the command line, just type ls -l@ <filename> to see what attributes are set for the file. To see the actual attribute, type xattr -p com.apple.TextEncoding <fil...
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Read/Write 'Extended' file properties (C#)

...thread at kixtart.org that has more information for other properties. Basically, you need to call the GetDetailsOf() method on the folder shell object for shell32.dll. share | improve this answer ...
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Is it possible to make the -init method private in Objective-C?

... Objective-C, like Smalltalk, has no concept of "private" versus "public" methods. Any message can be sent to any object at any time. What you can do is throw an NSInternalInconsistencyException if your -init method is invoked: - (id)init { ...
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Android Writing Logs to text File

... code of Mine but then this method creates file but contains nothing. Basically I want to read previous contents of the file and then append my data with the existing content. ...