I have this replacement array named $initialdata
:
array ($initialdata)
'd' => string '1.40' (length=4)
'a' => string '1.67' (length=4)
'vi' => string '0' (length=1)
't' => string '?' (length=1)
Then I have this string :
$str = "-(vi + sqrt(2*a*d + vi^2))/a)";
When I do :
str_replace(array_keys($initialdata),array_values($initialdata),$str);
I Get :
-(0 + sqr?(2*1.67*1.40 + 0^2))/1.67)
What happened was that the "t" of the "sqrt" was replaced by the value of "t" on my $initialdata
array. I know that this happens because I'm using str_replace
, and I need to match whole words using preg_replace
, however I never saw any implementation of preg_replace
using associative arrays to match any whole word. How can this be achieved if possible?
In regex, \\b
are the word boundaries. This should work:
$data = array(
'/d/' => '1.40',
'/a/' => '1.67',
'/vi/' => '0',
'/\bt\b/' => '?'
);
$result = preg_replace(array_keys($data), array_values($data), $str);
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