How to combine two strings together in PHP?

问题

I don't actually know how to describe what I wanted but I'll show you:

For example:

$data1 = "the color is";
$data2 = "red";

What should I do (or process) so $result is the combination of $data1 and $data2?

Desired result:

$result = "the color is red";

回答1:

$result = $data1 . $data2;

This is called string concatenation. Your example lacks a space though, so for that specifically, you would need:

$result = $data1 . ' ' . $data2;

回答2:

There are several ways to concatenate two strings together.

Use the concatenation operator . (and .=)

In PHP . is the concatenation operator which returns the concatenation of its right and left arguments

$data1 = "the color is";
$data2 = "red";
$result = $data1 . ' ' . $data2;

If you want to append a string to another string you would use the .= operator:

$data1 = "the color is ";
$data1 .= "red"

Complex (curly) syntax / double quotes strings

In PHP variables contained in double quoted strings are interpolated (i.e. their values are "swapped out" for the variable). This means you can place the variables in place of the strings and just put a space in between them. The curly braces make it clear where the variables are.

$result = "{$data1} {$data2}";

Note: this will also work without the braces in your case:

$result = "$data1 $data2";

Use sprintf() or printf()

sprintf() allows us to format strings using powerful formatting options. It is overkill for such simple concatenation but it handy when you have a complex string and/or want to do some formatting of the data as well.

$result = sprintf("%s %s", $data1, $data2);

printf() does the same thing but will immediately display the output.

printf("%s %s", $data1, $data2);
// same as
$result = sprintf("%s %s", $data1, $data2);
echo $result;

Heredoc

Heredocs can also be used to combine variables into a string.

$result= <<<EOT
$data1 $data2
EOT;

Use a , with echo()

This only works when echoing out content and not assigning to a variable. But you can use a comma to separate a list of expressions for PHP to echo out and use a string with one blank space as one of those expressions:

echo $data1, ' ', $data2;

回答3:

Concatenate them with the . operator:

$result = $data1 . " " . $data2;

Or use string interpolation:

$result = "$data1 $data2";

回答4:

No one mentioned this but there is other possibility. I'm using it for huge sql queries. You can use .= operator :)

$string = "the color is ";
$string .= "red";

echo $string; // gives: the color is red

回答5:

$result = implode(' ', array($data1, $data2));

is more generic.

回答6:

Another form available is this:

<?php
$data1 = "the color is";
$data2 = "red";
$result = "{$data1} {$data2}";

回答7:

You can try the following line of code

$result = $data1." ".$data2;

回答8:

You can do this using PHP:

$txt1 = "the color is";
$txt2 = " red!";
echo $txt1.$txt2;

This will combine two strings and the putput will be: "the color is red!".

回答9:

A period is used to concatenate strings. Simple example to turn two string variables into a single variable:

$full = $part1 . $part2;

In your example, you'd want to do:

$result = $data1 . ' ' . $data2;

You'll notice I added a string of one space between the two variables. This is because your original $data1 did not end with a space. If you had combined them without it, your $result variable would end up looking like the color isred.

回答10:

$result = $data1 . $data2;

try this

回答11:

This should work for you:

$result = $data1." ".$data2;

Reference: PHP String Variables

回答12:

$s = "my name is ";

$s .= "keyur";

echo $s; 

result:

my name is keyur

回答13:

I am not exactly clear with what your requirements are but basically you could seperately define the two variables and thereafter combine them together.

$data1="The colour is ";
$data2="red";

$result=$data1.$data2;

By doing so you can even declare $data2 as a global level so you could change its value during execution, for instance it could obtain the answer "red" from a checkbox.

回答14:

I believe the most performant way is:

$data1 = "the color is";
$data2 = "red";
$result = $data1 . ' ' . $data2;

If you want to implement localisation, you may do something like this:

$translationText = "the color is %s";
$translationRed  = "red";
$result = sprintf($translationText, $translationRed);

It's a bit slower, but it does not assume grammar rules.

回答15:

1.Concatenate the string (space between each string)

Code Snippet :

<?php
 $txt1 = "Sachin";
 $txt2 = "Tendulkar";

 $result = $txt1.$txt2 ;
 echo  $result. "\n";
 ?>  

Output: SachinTendulkar

2.Concatenate the string where space exists

Code Snippet :

<?php
 $txt1 = "Sachin";
 $txt2 = "Tendulkar";

 $result = $txt1." ".$txt2; 
 echo  $result. "\n";
?>  

Output : Sachin Tendulkar

3. Concatenate the string using printf function.

Code Snippet :

  <?php
 $data1 = "Sachin";
 $data2 = "Tendulkar";
 printf("%s%s\n",$data1, $data2);
 printf("%s %s\n",$data1, $data2); 
?>

Output:
SachinTendulkar
Sachin Tendulkar

回答16:

$result = $data1 . ' ' . $data2;

回答17:

Try this , we can append string in php with dot (.) symbol

$data1 = "the color is";
$data2 = "red";

echo $data1.$data2; //the color isred
echo $data1." ".$data2; // the color is red (we have appended space)

来源：https://stackoverflow.com/questions/48251817/join-value-in-php-for-reload-page