Check whether an array is empty

Question

I have the following code   lt  php   error   array     error  something     false   error  somethingelse     false   if   empty  error         echo  Error     else       echo  No errors        gt    However  empty  error  still returns true  even though nothing is set   What s not right

User · Answer

In PHP  even if the individual items within an array or properties of an object are empty  the array or object will not evaluate to empty using the empty  subject  function  In other words  cobbling together a bunch of data that individually tests as  empty  creates a composite that is non-empty  Use the following PHP function to determine if the items in an array or properties of an object are empty   function functionallyEmpty  o      if  empty  o   return true    else if  is numeric  o   return false    else if  is string  o   return  strlen trim  o       else if  is object  o   return functionallyEmpty  array  o         If it s an array    foreach  o as  element       if  functionallyEmpty  element   continue       else return false         all good    return true      Example Usage    subject   array               empty  subject      returns false functionallyEmpty  subject      returns true  class  Subject       a   gt          b   gt  array       theSubject   new Subject     empty  theSubject      returns false functionallyEmpty  theSubject      returns true

User · Answer

Try to check it s size with sizeof if 0 no elements

User · Answer

From the PHP-documentation      Returns FALSE if var has a non-empty and non-zero value    The following things are considered to be empty       an empty string  0  0 as an integer  0 0  0 as a float   0   0 as a string  NULL FALSE array    an empty array  var  var   a variable declared  but without a value in a class

User · Answer

I can t replicate that  php 5 3 6    php  gt   error   array    php  gt   error  something     false  php  gt   error  somethingelse     false  php  gt  var dump empty  error    bool false   php  gt   error   array    php  gt  var dump empty  error    bool true  php  gt    exactly where are you doing the empty   call that returns true

User · Answer

hi array is one object so it null type or blank      lt  php         if  error  null              echo  array is blank or null or not array         OR        if  empty  error              echo  array is blank or null or not array         OR      if is array  error              echo  array is blank or null or not array        gt

User · Answer

PHP s built-in empty   function checks to see whether the variable is empty  null  false  or a representation of zero  It doesn t return true just because the value associated with an array entry is false  in this case the array has actual elements in it and that s all that s evaluated   If you d like to check whether a particular error condition is set to true in an associative array  you can use the array keys   function to filter the keys that have their value set to true    set errors   array keys   errors  true      You can then use the empty   function to check whether this array is empty  simultaneously telling you whether there are errors and also which errors have occurred

User · Answer

You can also check it by doing   if count  array   gt  0        echo  Error     else       echo  No Error

User · Answer

function empty   does not work for testing empty arrays  example    a array         if empty  a   echo  empty   else echo  not empty     this case is true   a function is necessary   function is array empty  a   foreach  a as  elm  if  empty  elm   return false  return true      ok  this is a very old question      but i found this thread searching for a solution and i didnt find a good one   bye  sorry for my english

User · Answer

There are two elements in array and this definitely doesn t mean that array is empty  As a quick workaround you can do following    errors   array filter  errors    if   empty  errors         array filter   function s default behavior will remove all values from array which are equal to null  0     or false   Otherwise in your particular case empty   construct will always return true if there is at least one element even with  empty  value

User · Answer

array with zero elements converts to false  http   php net manual en language types boolean php

User · Answer

However  empty  error  still returns true  even though nothing is set    That s not how empty   works  According to the manual  it will return true on an empty array only  Anything else wouldn t make sense

User · Answer

lt  php if empty  myarray   echo true   else echo  false     gt

[php] Check whether an array is empty

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