what is difference between print_r and echo in php?
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The difference is that print_r recursively prints an array (or object, but it doesn't look as nice), showing all keys and values. echo does not, and is intended for scalar values. print_r prints human-readable information about a variable, while echo is used only for strings.
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They are both used to output data to the screen. The differences are small: echo has no return value while print has a return value of 1 so it can be used in expressions. ... echo is marginally faster than print .
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The var_dump function displays structured information about variables/expressions including its type and value. ... The print_r() displays information about a variable in a way that's readable by humans. array values will be presented in a format that shows keys and elements. Similar notation is used for objects.
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Difference between the methods print and println. The println("...") method prints the string "..." and moves the cursor to a new line. The print("...") method instead prints just the string "...", but does not move the cursor to a new line. Hence, subsequent printing instructions will print on the same line.
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As nouns the difference between echo and resonance is that echo is a reflected sound that is heard again by its initial observer while resonance is the condition of being resonant.
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The two versions have different print statement syntaxes Essentially, in Python 3, the print statement has been replaced with a print () function. For example, in Python 2 it is print “hello” but in Python 3 it is print (“hello”). ... To learn more differences between Python 2 and 3, check out The Python Wiki.
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Difference between print() and println() in Java Sr. No. print method is implemented as it prints the text on the console and the cursor remains at the end of the text at the console. ... While println adds new line after print text on console.
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['<? php.', '$t;$b=2;$a=3;$c=4;$x;$y;', '$t=(pow($b,2))-(4*$a*$c);', 'if($t<=0)', '$t=(-1)*$t;', '$x=(-2*$c)/($b+(sqrt($t)));', '$y=(-2*$c)/($b-(sqrt($t)));', 'echo sprintf("Solution in Addition = %f \\n Solution in Subtraction = %f" ,$x,$y);']
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Answer 51900c3fa31802c99c0043c6 print just shows the human user a string representing what is going on inside the computer. The computer cannot make use of that printing. return is how a function gives back a value. This value is often unseen by the human user, but it can be used by the computer in further functions.
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Answer: Use the PHP array_values() Function Alternativly, you can also use the reset() function to get the first element. The reset() function set the internal pointer of an array to its first element and returns the value of the first array element, or FALSE if the array is empty.
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The difference between printf and print is the format argument. This is an expression whose value is taken as a string; it specifies how to output each of the other arguments. It is called the format string. The format string is very similar to that in the ISO C library function printf .
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The fputs() function in PHP is an inbuilt function which is used to write to an open file. The fputs() function stops at the end of the file or when it reaches the specified length passed as a parameter, whichever comes first.
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printf is a generic printing function that works with 100 different format specifiers and prints the proper result string. putchar , well, puts a character to the screen. That also means that it's probably much faster.
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1 Answer. You have to set the selected attribute for the option that was submitted. So you have to check the submitted value for each option. In my solution I am using the ternary operator to echo the selected attribute only for the correct operator.
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['<? php.', '$x=30;', '$y=15;', '$z=$x-$y;', 'echo "Difference: ",$z;', '?>']
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There are two different functions that stderr include are fprintf(), fputs(). If we use it for writing the out message to the file then we have to use: FILE *stderr. This stderr is a standard error stream is the default destination for printing the output message as an error message.
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There IS a difference guys. DIE() can be used with other failable functions whereas echoing would need to caught as an error or exception.