UnNecessaryDoubleQuotes

info off by default quick-fix

Group: Code style · PhpStorm name: UnNecessaryDoubleQuotesInspection

A double-quoted string that contains no interpolation and no escape sequence behaves exactly like a single-quoted one. Single quotes make it obvious that nothing is evaluated inside.

Example

Before

<?php
$label  = "ready";
$price  = "\$9 \"net\"";
$none   = "";
$dollar = "cost: $";

$kept1 = 'already single';
$kept2 = "hello {$name}";
$kept3 = "it's";
$kept4 = "line\n";
$kept5 = "C:\\temp";
$kept6 = <<<TXT
body
TXT;

After fix

<?php
$label  = 'ready';
$price  = '$9 "net"';
$none   = '';
$dollar = 'cost: $';

Reported:

• line 2: No interpolation or escapes here; use single quotes.
• line 3: No interpolation or escapes here; use single quotes.
• line 4: No interpolation or escapes here; use single quotes.
• line 5: No interpolation or escapes here; use single quotes.

Configure

In custos.json:

{
  "rules": {
    "UnNecessaryDoubleQuotes": {
      "enabled": true
    }
  }
}

Suppress

Before the statement or declaration (or the first statement of the file), either of:

// @custos-ignore UnNecessaryDoubleQuotes

/**
 * @noinspection UnNecessaryDoubleQuotesInspection
 */