PhpToken represents a token produced while parsing PHP source into lexical units.
What Is PhpToken::is in PHP?
PhpToken::is() inspects an individual token produced by tokenize().
PhpToken::is($kind) : boolParameters:
$kind— Required. The kind argument used to configure this operation; its accepted values follow the declared PHP type.
Return type: bool. Token IDs represent language constructs; token text can include whitespace and punctuation.
Example 1: Understanding the Basic Behavior
<?php
$tokens = PhpToken::tokenize("<?php echo 7 + 3;");
$token = $tokens[1];
var_dump($token->is(T_ECHO));Output:
bool(true)Explanation: PhpToken::is() inspects an individual token produced by tokenize().
Example 2: Testing Another Case
<?php
$tokens = PhpToken::tokenize("<?php echo 11 + 2;");
$token = $tokens[1];
var_dump($token->is(T_ECHO));Output:
bool(true)Explanation: Token IDs represent language constructs; token text can include whitespace and punctuation.
Practical Example: Applying the Operation
<?php
$tokens = PhpToken::tokenize("<?php echo 8 * 5;");
$token = $tokens[1];
var_dump($token->is(T_ECHO));Output:
bool(true)Explanation: Token IDs and token text vary with the supplied source; whitespace tokens can matter.
Important Behavior and Edge Cases
- Token IDs represent language constructs; token text can include whitespace and punctuation.
- Token IDs and token text vary with the supplied source; whitespace tokens can matter.
Comparison With Related Approaches
| Approach | When to Use It |
|---|---|
PhpToken::is | PhpToken::is() inspects an individual token produced by tokenize(). |
PhpToken::tokenize() | PhpToken offers objects with methods, while token_get_all() returns traditional arrays. |
Common Beginner Mistakes
| Mistake | Correct Approach |
|---|---|
| Misinterpreting the documented behavior of PhpToken::is() for the supplied value. | Token IDs represent language constructs; token text can include whitespace and punctuation. |
| Choosing PhpToken::tokenize() without checking whether it provides the same result. | PhpToken offers objects with methods, while token_get_all() returns traditional arrays. |
Key Takeaways
- PhpToken::is() inspects an individual token produced by tokenize().
- Token IDs represent language constructs; token text can include whitespace and punctuation.
- Token IDs and token text vary with the supplied source; whitespace tokens can matter.
The examples demonstrate where PhpToken::is fits within php token inspection. Verify the relevant preconditions whenever you adapt the code to real data.