Replace date with dynamic date format in given string - php

Question

My string is given below.
$str = 'Hi $name. This is a reminder of your appointment at $dateformat("h:i A") on $dateformat("M d,Y").';
Suppose date is (coming from DB),
$appoinmentDate = '2019-02-02'
Now, I want to do following things with string
replace $name with John(name is coming from DB)
replace $dateformat("h:i A") with 08:52 AM (time is coming from DB)
$dateformat("M d,Y") should be replace with date("M d,Y",$appoinmentDate) and its result
should be Feb 02,2019 Like this
Important thing: $dateformat("h:i A") and $dateformat("M d,Y") will be dynamic it can be any possible date format
Can any one please help me to find out the solution?

Answer 1

You could use a regular expression that parses $str looking for any word starting with a $, and possibly followed by a ("...") sequence.
If there is a parentheses sequence, take all between the "" and use this as date format in a DateTime->format() call.
Finally, do 1 sprintf() with all the replacements and date/time insertions done at runtime
EDIT
Try this testscript :
<?php
//creating test string
$teststr='Hi $name. This is a reminder of your appointment at $dateformat("h:i A") on $dateformat("M d,Y").' ;
// parse all date format matches
$regex= "/[\$]dateformat\(?\"?([^\"]*)\"\)/" ;
$DTmatches=Array();
// try to match all $dateformat() occurences
if (preg_match_all($regex, $teststr, $DTmatches) )
{
echo sprintf("Found following matches: %s \r\n", print_r($DTmatches,true));
// replace this with your DB timestamp
$theDT = new DateTime("now", new DateTimeZone("UTC")) ;
// count the occurences
$nofOccurences = count($DTmatches[0]) ;
// run over each occurence
for ($i=0; $i < $nofOccurences; $i++)
$teststr = str_replace( $DTmatches[0][$i], $theDT->format($DTmatches[1][$i]), $teststr ) ;
}
else
echo "no dateformat() found" ;
echo sprintf("Replaced test string is: %s \r\n", $teststr) ;
?>

Answer 2

$copy_date = 'Hi test. This is a reminder of your appointment at $dateformat("h:i A") on $dateformat("M d,Y").';
$str = preg_replace('/\$dateformat\(\"h:i A\"\)/', date("h:i A"), $copy_date);
$str1 = preg_replace('/\$dateformat\(\"...../', "", $str);
$str2 = preg_replace('/\"\)/', "'Your Date'", $str1);
In the above code you can replace first date with date format and in other you can set date or text instead of Your date.
If you want to replace both data then remove date("h:i A").