1
I have it (preg_match('/^\d*$/', $nr_procedimento) ? 'f' : 't';
) in a code, but I have no idea what it does, more precisely the part of preg_match('/^\d*$/'
. Does anyone know?
1
I have it (preg_match('/^\d*$/', $nr_procedimento) ? 'f' : 't';
) in a code, but I have no idea what it does, more precisely the part of preg_match('/^\d*$/'
. Does anyone know?
2
The function preg_match
matches a regular expression in a string, returning 1
in match case, 0
if there was no match and false
in case any error has occurred.
You pass two parameters to it, the first being a regular expression and the second the string to be checked.
In your case the regex is /^\d*$/
, defining each part:
/ indicates the start of the regular expression
^ indicates that your pattern starts as follows
\d defines that they are numerical values
* defines that the previous element may occur 0 or n times
$ indicates that your string should end here
/ indicates the end of regular expression
You can see more about preg_match
here.
In your complete example you have a ternary.
preg_match('/^\d*$/', $nr_procedimento) ? 'f' : 't';
In this case, if the contents of the variable $nr_procedimento
der match na regex shown, the value f
will be returned by the ternary, otherwise will be returned t
.
It is worth noting that it is an instruction inline who will return f or t - the ugly way to FALSE or TRUE. I only commented here as an observation, because you gave the output of the function, and it will have something other than 0
or 1
.
Huum legal, thank you for the explanation.
Well quoted @Papacharlie, I’m going to edit and add this. I ended up just explaining the preg_match
for that is what he asked in the description of the question, but the title induces the rest.
1
Is a regular expression to find a line that starts and ends with numbers. The heaped symbols are known as meta characters, each has a function:
^
- means beginning of line.
\d
- is an abbreviation for [0-9] or just numbers.
*
- makes the greedy combination, if as many times as possible the defined pattern.
$
- means end of line
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