{"id":13508,"date":"2026-06-18T11:36:43","date_gmt":"2026-06-18T09:36:43","guid":{"rendered":"https:\/\/techmoz.net\/?p=13508"},"modified":"2026-06-18T11:36:43","modified_gmt":"2026-06-18T09:36:43","slug":"laravel-map-intval-collection-gotcha","status":"publish","type":"post","link":"https:\/\/techmoz.net\/en\/laravel-map-intval-collection-gotcha\/","title":{"rendered":"The map(‘intVal’) Trap in Laravel: Why Your Collection Doesn’t Do What You Think"},"content":{"rendered":"

Some small tips save you hours of headaches. This is one of them, and it comes from a tweet by @jordankdalton<\/a>. At first glance it looks like harmless code, but the result will surprise you. Let’s dive in!<\/p>\n

The Code That Looks Right (But Isn’t)<\/h3>\n

Imagine you have a collection of numbers stored as strings and you want to convert them to integers. The most “natural” approach would be to pass the function name straight into map<\/code>:<\/p>\n

collect(["1", "2", "3", "4"])->map('intVal');<\/pre>\n
What do you expect? Probably [1, 2, 3, 4]<\/code>. But what you actually get is this:<\/p>\n
[1, 0, 0, 0]<\/pre>\n
Weird, right? The first element is correct, but all the others turn into zero. So where does it break?<\/p>\n
Why This Happens<\/h3>\n
The secret lies in how the Collection’s map<\/code> calls your callback<\/strong>. Unlike what many people assume, it doesn’t pass just the value\u2014it passes two arguments<\/strong>: the value and the key<\/em> of the element. So under the hood, Laravel does something like this:<\/p>\n
intval("1", 0);  \/\/ key 0\r\nintval("2", 1);  \/\/ key 1\r\nintval("3", 2);  \/\/ key 2\r\nintval("4", 3);  \/\/ key 3<\/pre>\n
And here’s the trap: the second parameter of intval()<\/code> is the numeric base<\/strong> (the radix). So:<\/p>\n
    \n
  • intval(\"1\", 0)<\/code> \u2192 base 0 means “auto-detect” \u2192 returns 1<\/strong>.<\/li>\n
  • intval(\"2\", 1)<\/code> \u2192 base 1 is invalid \u2192 returns 0<\/strong>.<\/li>\n
  • intval(\"3\", 2)<\/code> \u2192 in base 2 (binary), “3” doesn’t exist \u2192 returns 0<\/strong>.<\/li>\n
  • intval(\"4\", 3)<\/code> \u2192 in base 3, “4” doesn’t exist \u2192 returns 0<\/strong>.<\/li>\n<\/ul>\n
    Mystery solved. The key ended up in the wrong place.<\/p>\n
    The Right Way to Do It<\/h3>\n
    The fix is simple: wrap the call in an arrow function so you control exactly which argument gets passed:<\/p>\n
    collect(["1", "2", "3", "4"])->map(fn($value) => intVal($value));\r\n\/\/ [1, 2, 3, 4] \u2014 winner!<\/pre>\n
    This way, the key is ignored and intval()<\/code> only receives the value, using base 10 by default. Clean result.<\/p>\n
    The Takeaway<\/h3>\n
    Be careful when passing a function name as a string<\/em> directly into map<\/code>\u2014especially if that function has optional parameters. Functions like intval()<\/code>, round()<\/code>, or number_format()<\/code> can “swallow” the key as a second argument and hand you crazy results. When in doubt, always use an arrow function or a closure: you keep full control and your code stays more readable. A tiny detail, a big difference. \ud83d\ude80<\/p>\n
    Have you ever fallen into this trap? Let us know in the comments!<\/p>\n","protected":false},"excerpt":{"rendered":"
    Using collect([…])->map(‘intVal’) looks harmless, but it returns [1, 0, 0, 0] instead of the numbers you expected. Here’s why \u2014 and the right way to do it.<\/p>\n","protected":false},"author":2,"featured_media":1,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_dcms_eufi_img":"https:\/\/images.unsplash.com\/photo-1542831371-29b0f74f9713?auto=format&fit=crop&w=1200&q=80","footnotes":"","_links_to":"","_links_to_target":""},"categories":[952],"tags":[],"class_list":["post-13508","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-highlights-2"],"yoast_head":"\nThe map('intVal') Trap in Laravel: Why Your Collection Doesn't Do What You Think - Techmoz<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/techmoz.net\/en\/laravel-map-intval-collection-gotcha\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"The map('intVal') Trap in Laravel: Why Your Collection Doesn't Do What You Think - Techmoz\" \/>\n<meta property=\"og:description\" content=\"Using collect([...])->map('intVal') looks harmless, but it returns [1, 0, 0, 0] instead of the numbers you expected. 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