PHP Use Regex match as key from POST array for replacement

Question

I have these variables:

$summary="The problem with field2 is field13.  The fix will be field7"
$_POST['field2']='thiscomputer';
$_POST['field7']='thishotfix';
$_POST['field13']='thisapplication';

I'm trying to craft a preg_replace() that will find /field[0-9]/ within the string and replace it with the value from the $_POST array. But I keep coming up short. Maybe preg_replace() is the wrong function to use in this instance. I'm trying to replace an old long list of 50+ str_replace's

Thanks for any help that can point me in the right direction

preg_replace is the way to go, but nowhere in your example is the string POST1. That might be your problem right there. — colburton
– colburton, Commented Dec 3, 2019 at 15:08

A l w a y s S u n n y · Accepted Answer · 2019-12-03 15:13:43Z

2

How about this single line str_replace instead of preg_replace? You may need to fix some spacing, that can be resolved by the array value

echo str_replace(array_keys($_POST),array_values($_POST),$summary);

Output:

The problem with thiscomputer is thisapplication.  The fix will be thishotfix

WORKING DEMO: https://3v4l.org/quYVO

answered Dec 3, 2019 at 15:13

A l w a y s S u n n y

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1 Comment

A l w a y s S u n n y Over a year ago

@eagers glad it helps you somehow :)

Progrock · Accepted Answer · 2019-12-03 15:47:55Z

1

strtr, though I'd probably want to copy and filter that post array:

<?php

$summary="The problem with field2 is field13.  The fix will be field7";
$_POST['field2']='thiscomputer';
$_POST['field7']='thishotfix';
$_POST['field13']='thisapplication';

echo strtr($summary, $_POST);

Output:

The problem with thiscomputer is thisapplication.  The fix will be thishotfix

answered Dec 3, 2019 at 15:47

Progrock

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3 Comments

Progrock Over a year ago

Note strtr and str_replace slightly differ in the way they substitute. See: stackoverflow.com/questions/8177296/…

A l w a y s S u n n y Over a year ago

Have a look here the benchmark simplemachines.org/community/index.php?topic=175031.0

eagers Over a year ago

This does indeed work, but since I am replacing old str_replace code, sticking with a new str_replace method works better for my team. Still Thank you!

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