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- Difference between isset() and empty() Functions
- Difference between die() and exit() functions in PHP
- Difference between isset() and array_key_exists() Function in PHP
- Difference between “!==” and “==!” in PHP
- Why to check both isset() and !empty() function in PHP ?
- What is the Difference Between unset and null in PHP ?
- D3.js | d3.set.empty() Function
- What is the difference between var_dump() and print_r() in PHP ?
- Difference Between Void and Non Void Methods in Java
- Difference between Set.clear() and Set.delete() Methods in JavaScript
- Explain the differences between empty() remove() and detach() methods in jQuery
- Difference Between WHERE FIND_IN_SET(…)>0 and WHERE FIND_IN_SET(…) in SQL
- Difference between NULL pointer, Null character ('\0') and '0' in C with Examples
- D3.js selection.empty() Function
- D3.js | d3.map.empty() Function
- list empty() function in C++ STL
- Deque::empty() and deque::size() in C++ STL
- bitset all() function in C++ STL
- multiset empty() function in C++ STL
- list::empty() and list::size() in C++ STL
Last Updated : 23 Sep, 2021
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The empty() function is an inbuilt function in PHP that is used to check whether a variable is empty or not.
These values are considered to be empty values:
- “” ( 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)
Example: Below example illustrate the empty() function in PHP.
PHP
<?php// PHP code to demonstrate the working// of empty() functionSee AlsoW3Schools.comHow to Check If an Array Is Empty in PHPWhen to Use NULL and When to Use Empty String$var1= 0;$var2= 0.0;$var3="0";$var4= NULL;$var5= false;$var6=array();$var7="";// For value 0 as integerempty($var1) ? print_r("True\n") : print_r("False\n");// For value 0.0 as floatempty($var2) ? print_r("True\n") : print_r("False\n");// For value 0 as stringempty($var3) ? print_r("True\n") : print_r("False\n");// For value Nullempty($var4) ? print_r("True\n") : print_r("False\n");// For value falseempty($var5) ? print_r("True\n") : print_r("False\n");// For arrayempty($var6) ? print_r("True\n") : print_r("False\n");// For empty stringempty($var7) ? print_r("True\n") : print_r("False\n");// For not declare $var8empty($var8) ? print_r("True\n") : print_r("False\n");?>Output
TrueTrueTrueTrueTrueTrueTrueTrue
isset() Function: The isset() function is an inbuilt function in PHP that is used to determine if the variable is declared and its value is not equal to NULL.
Parameters: This function accepts one or more parameters as mentioned above and described below.
- $var: It contains the variable which needs to check.
- $…: It contains the list of other variables.
Return Value: It returns TRUE if var exists and its value is not equal to NULL and FALSE otherwise.
Example 2: Below examples illustrate the isset() function in PHP:
PHP
<?php$str="GeeksforGeeks";// Check value of variable is set or notif(isset($str)) {echo"Value of variable is set";}else{echo"Value of variable is not set";}$arr=array();// Check value of variable is set or notif( !isset($arr[0]) ) {echo"\nArray is Empty";}else{echo"\nArray is not empty";}?>Output
Value of variable is setArray is Empty
PHP program using both isset() and empty() functions:
PHP
<?php// PHP function to demonstrate// isset() and !empty() function// initialize a variable$num='0';// Check isset() functionif( isset ($num) ) {print_r($num." is set with isset function");}// Display new lineecho"\n";// Initialize a variable$num= 1;// Check the !empty() functionif( !empty($num) ) {print_r($num." is set with !empty function");}?>Output:
0 is set with isset function1 is set with !empty function
Difference between isset() and empty() function:
isset() Function
empty() Function
The isset() function is an inbuilt function in PHP that is used to determine if the variable is declared and its value is not equal to NULL. The empty() function is an inbuilt function in PHP that is used to check whether a variable is empty or not. The isset() function will generate a warning or e-notice when the variable does not exists. The empty() function will not generate any warning or e-notice when the variable does not exists.
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'); $('.spinner-loading-overlay').show(); jQuery.ajax({ url: writeApiUrl + 'create-improvement-post/?v=1', type: "POST", contentType: 'application/json; charset=utf-8', dataType: 'json', xhrFields: { withCredentials: true }, data: JSON.stringify({ gfg_id: post_id, check: true }), success:function(result) { jQuery.ajax({ url: writeApiUrl + 'suggestions/auth/' + `${post_id}/`, type: "GET", dataType: 'json', xhrFields: { withCredentials: true }, success: function (result) { $('.spinner-loading-overlay:eq(0)').remove(); var commentArray = result; if(commentArray === null || commentArray.length === 0) { // when no reason is availaible then user will redirected directly make the improvment. // call to api create-improvement-post $('body').append('
'); $('.spinner-loading-overlay').show(); jQuery.ajax({ url: writeApiUrl + 'create-improvement-post/?v=1', type: "POST", contentType: 'application/json; charset=utf-8', dataType: 'json', xhrFields: { withCredentials: true }, data: JSON.stringify({ gfg_id: post_id, }), success:function(result) { $('.spinner-loading-overlay:eq(0)').remove(); $('.improve-modal--overlay').hide(); $('.unlocked-status--improve-modal-content').css("display","none"); $('.create-improvement-redirection-to-write').attr('href',writeUrl + 'improve-post/' + `${result.id}` + '/', '_blank'); $('.create-improvement-redirection-to-write')[0].click(); }, error:function(e) { $('.spinner-loading-overlay:eq(0)').remove(); var result = e.responseJSON; if(result.detail.non_field_errors.length){ $('.improve-modal--improve-content .improve-modal--improve-content-modified').text(`${result.detail.non_field_errors}.`); jQuery('.improve-modal--overlay').show(); jQuery('.improve-modal--improvement').show(); $('.locked-status--impove-modal').css("display","block"); $('.unlocked-status--improve-modal-content').css("display","none"); $('.improve-modal--improvement').attr("status","locked"); $('.improvement-reason-modal').hide(); } }, }); return; } var improvement_reason_html = ""; for(var comment of commentArray) { // loop creating improvement reason list markup var comment_id = comment['id']; var comment_text = comment['suggestion']; improvement_reason_html += `
${comment_text}
`; } $('.improvement-reasons_wrapper').html(improvement_reason_html); $('.improvement-bottom-btn').html("Create Improvement"); $('.improve-modal--improvement').hide(); $('.improvement-reason-modal').show(); }, error: function(e){ $('.spinner-loading-overlay:eq(0)').remove(); // stop loader when ajax failed; }, }); }, error:function(e) { $('.spinner-loading-overlay:eq(0)').remove(); var result = e.responseJSON; if(result.detail.non_field_errors.length){ $('.improve-modal--improve-content .improve-modal--improve-content-modified').text(`${result.detail.non_field_errors}.`); jQuery('.improve-modal--overlay').show(); jQuery('.improve-modal--improvement').show(); $('.locked-status--impove-modal').css("display","block"); $('.unlocked-status--improve-modal-content').css("display","none"); $('.improve-modal--improvement').attr("status","locked"); $('.improvement-reason-modal').hide(); } }, }); }); $('.left-arrow-icon_wrapper').on('click',function(){ if($('.improve-modal--suggestion').is(":visible")) $('.improve-modal--suggestion').hide(); else{ $('.improvement-reason-modal').hide(); } $('.improve-modal--improvement').show(); }); jQuery('.suggest-bottom-btn').on('click', function(){ var suggest_val = $.trim($("#suggestion-section-textarea").val()); var error_msg = false; if(suggest_val != ""){ if(suggest_val.length <= 2000){ jQuery('body').append('
'); jQuery('.spinner-loading-overlay').show(); jQuery.ajax({ type:'post', url: "https://apiwrite.geeksforgeeks.org/suggestions/auth/create/", xhrFields: { withCredentials: true }, crossDomain: true, contentType:'application/json', data: JSON.stringify({ "gfg_post_id" : `${post_id}`, "suggestion" : `
${suggest_val}
` }), success:function(data) { jQuery('.spinner-loading-overlay:eq(0)').remove(); jQuery('#suggestion-section-textarea').val(""); jQuery('.suggest-bottom-btn').html("Sent "); setTimeout(() => { jQuery('.improve-modal--overlay').hide(); $('.improve-modal--suggestion').hide(); }, 1000); }, error:function(data) { jQuery('.spinner-loading-overlay:eq(0)').remove(); jQuery('#suggestion-modal-alert').html("Something went wrong."); jQuery('#suggestion-modal-alert').show(); error_msg = true; } }); } else{ jQuery('#suggestion-modal-alert').html("Character limit exceeded."); jQuery('#suggestion-modal-alert').show(); jQuery('#suggestion-section-textarea').focus(); error_msg = true; } } else{ jQuery('#suggestion-modal-alert').html("Enter valid input."); jQuery('#suggestion-modal-alert').show(); jQuery('#suggestion-section-textarea').focus(); error_msg = true; } if(error_msg){ setTimeout(() => { jQuery('#suggestion-section-textarea').focus(); jQuery('#suggestion-modal-alert').hide(); }, 3000); } }) $('.improvement-bottom-btn.create-improvement-btn').click(function() { //create improvement button is clicked $('body').append('
'); $('.spinner-loading-overlay').show(); // send this option via create-improvement-post api jQuery.ajax({ url: writeApiUrl + 'create-improvement-post/?v=1', type: "POST", contentType: 'application/json; charset=utf-8', dataType: 'json', xhrFields: { withCredentials: true }, data: JSON.stringify({ gfg_id: post_id }), success:function(result) { $('.spinner-loading-overlay:eq(0)').remove(); $('.improve-modal--overlay').hide(); $('.improvement-reason-modal').hide(); $('.create-improvement-redirection-to-write').attr('href',writeUrl + 'improve-post/' + `${result.id}` + '/', '_blank'); $('.create-improvement-redirection-to-write')[0].click(); }, error:function(e) { $('.spinner-loading-overlay:eq(0)').remove(); var result = e.responseJSON; if(result.detail.non_field_errors.length){ $('.improve-modal--improve-content .improve-modal--improve-content-modified').text(`${result.detail.non_field_errors}.`); jQuery('.improve-modal--overlay').show(); jQuery('.improve-modal--improvement').show(); $('.locked-status--impove-modal').css("display","block"); $('.unlocked-status--improve-modal-content').css("display","none"); $('.improve-modal--improvement').attr("status","locked"); $('.improvement-reason-modal').hide(); } }, }); });
