Php Learning Log (3)-echo & amp; print, php Learning Log-echo

Php Learning Log (3)-echo & print, php Learning Log-echo

In php, there are two methods to output the result: echo and print. The following compares the two methods.

Differences between echo and print:

	Echo	Print
Continuous output string	Continuous output of multiple strings	Only one string can be output.
Return Value	None	Return 1
Usage	Echo or echo ()	Print or print ()

(1) echo can output multiple consecutive strings, and print can only output one string:

Instance 1:

<? Php/* echo can output multiple consecutive strings, and print can only output one string */echo "echo outputs one string:"; echo "hello, world "; // echo outputs a string echo "<br/>"; echo "echo outputs multiple strings:"; echo "hello, world", "hello, php", "hello, python "; // echo outputs multiple strings echo" <br/> "; print" print outputs a string: "; print" hello, world "; // print outputs a string print "<br/>";/* start-[print outputs multiple strings consecutively]-start */

Print "print Output multiple strings:"; print "hello, world", "hello, php", "hello, python"; // print Output multiple strings, error prompt: parse error: syntax error, unexpected ', 'in C: \ Users \ 13842 \ PhpstormProjects \ test \ print & echo. php on line 14/* end-[print multiple consecutive strings]-end */print "<br/>";?>

The code that shields print from outputting multiple strings consecutively. The result is as follows:

If you do not block the code that outputs multiple strings consecutively by print, an error occurs (syntax error ):

(2) No return value for echo. print always returns 1.

<? Php/* print returns 1, and echo does not return the value */$ print_value = print "hello, world <br/>"; // result: hello, worldprint "returns $ print_value "; // result: the returned value is 1 $ echo_value = echo "hello, world <br/>"; // syntax error?>

(3) There is no difference between the output mode with and without brackets. I will not explain it here.

 

 

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