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C0D3BREAK3R
Asked: 2020-09-27 17:26:02 +0800 CST 2020-09-27 17:26:02 +0800 CST

Subtract a variable from a string in PHP (Curiosity)

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I would like to know if it is possible to obtain this result:

Subtraction of 5-1 equals 4

I know if I do this I can get it:

$numero = 5;
$numero2 = 1;

$resultado = $numero - $numero2;

echo "La resta de 5-1 es igual a $resultado";

But I want to get that result by doing something like this (I know it's wrong but it's so you understand me)

$numero =5;

echo "La resta de 5-1 es igual a $numero-1";

I would like to know if it is possible to do something like that.

Also know if it is possible to perform a subtraction of numbers in the string in a similar way as I expressed it before, for example:

echo "La resta de 5-1 es igual a 5-1(y que me de 4)";

It is a curiosity that I had.

Thanks in advance

php

1 Answers

  1. Best Answer

    In PHP you cannot perform operations on variables inside strings, for example:

    $num = 5;
echo "Resta = $num - 1"; // Resta = 5 - 1

    PHP only interprets the variable, without performing any operations.

    Things that do work: Concatenate or use replacement functions likesprintf()

    $num = 5;
echo "Resta = " . ($num - 1); // Resta = 4
echo sprintf("Resta = %d", $num - 1); // Resta = 4
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